305 - x + 14 = 48 + ( x - 23 )
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\(x\) + (-31) - (42) = -45
\(x\) - (31 + 42) = -45
\(x\) - 73 = -45
\(x\) = -45 + 73
\(x\) = 28
305 - \(x\) + 14 = 48 + (\(x\) - 23)
(305 + 14) - \(x\) = (48 - 23) + \(x\)
319 - \(x\) = 25 + \(x\)
\(x\) + \(x\) = 319 - 25
2\(x\) = 294
\(x\) = 294 : 2
\(x\) = 147
\(x-43=\left(35-x\right)\) - 48
\(x\) - 43 = 35 - \(x\) - 48
\(x\) - 43 = - (48 - 35) - \(x\)
\(x\) - 43 = - 13 - \(x\)
\(x\) + \(x\) = -13 + 43
2\(x\) = 30
\(x\) = 30 : 2
\(x\) = 15
x + (-31) - 42 = -45
x - 73 = -45
x = -45 + 73
x = 28
-------
305 - x + 14 = 48 + (x - 23)
319 - x = 48 + x - 23
-x - x = 25 - 319
-2x = -294
x = -294 : (-2)
x = 147
--------
x - 43 = (35 - x) - 48
x = 35 - x - 48 + 43
x + x = 30
2x = 30
x = 30 : 2
x = 15
![](https://rs.olm.vn/images/avt/0.png?1311)
305 - x + 14 = 48 + x - 23
(=) -x - x = 48 - 23 - 305 - 14
(=) -2x = -294
(=) x = -294 : (-2)
(=) x = 147
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
a, 305-x+14=48+x-23
<=> 319-x=25+x
<=>x=-147
b, -35+x-37+x=33-x
<=> -72+2x=33-x
<=> 2x+x=33+72
<=> 3x=105 <=> x=35
![](https://rs.olm.vn/images/avt/0.png?1311)
a)305-x-14=48+(-23)
<=>291-x=25
<=>x=291-25
<=>x=266
Vậy x= 266
b)(-14)+x-7=-10
<=>(-21)+x=-10
<=>x=(-10)-(-21)
<=>x=(-10)+21
<=>x=11
Vậy x= 11
![](https://rs.olm.vn/images/avt/0.png?1311)
3x - 82 = 2-x
=> 3x+x = 2+82
=> 4x = 84
=> x = 84 : 4
=> x = 21
vậy_____
305 + x + 14 = 48 - ( x - 23)
=> 319 + x = 48 - x + 23
=> 319 + x = 71 - x
=> x+x = 71 - 319
=> 2x = -248
=> x = -248 : 2
=> x = -124
vậy____
3x - 82 = 2 - x
<=> 3x + x = 2 + 82
<=> 4x = 84
<=> x = \(\frac{84}{4}\)= 21
![](https://rs.olm.vn/images/avt/0.png?1311)
a)
305 - x + 14 = 48 + (x - 23)
<=>319-x =48+x-23
<=>319-x=25+x
Chuyển vế đổi dấu, Ta có:
-2x=-294
<=>x=147
Vậy giá trị của x là 147
Còn câu b) thì mình chịu SORRY bạn nhé ! Chúc bạn học tốt .
\(a,305-x+14=48+\left(x-23\right)\)
\(\Leftrightarrow-x-x=48-23-14-305\)
\(\Leftrightarrow-2x=-294\)
\(\Leftrightarrow x=147\)
\(b,-\left(35-x\right)-\left(37-x\right)=33-x\)
\(\Leftrightarrow-35+x-37+x=33-x\)
\(\Leftrightarrow2x+x=33+35+37\)
\(\Leftrightarrow3x=105\)
\(\Leftrightarrow x=35\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a: \(x-43=\left(35-x\right)-48\)
=>\(x-43=35-x-48\)
=>\(x-43=-x-13\)
=>\(x+x=-13+43\)
=>2x=30
=>x=30/2=15
b: \(305-x+14=48+\left(x-23\right)\)
=>\(319-x=48+x-23=25+x\)
=>\(x+25=319-x\)
=>\(x+x=319-25\)
=>\(2x=294\)
=>\(x=\dfrac{294}{2}=147\)
c: \(-\left(-x-6+85\right)=\left(x+51\right)-54\)
=>\(-\left(-x+79\right)=x+51-54\)
=>x-79=x-3
=>-79=-3(vô lý)
=>\(x\in\varnothing\)
d: \(-\left(35-x\right)-\left(37-x\right)=33-x\)
=>\(-35+x-37+x=33-x\)
=>2x-72=-x+33
=>\(2x+x=33+72\)
=>3x=105
=>\(x=\dfrac{105}{3}=35\)
x=147
=>-x-x=48-23-305-14
-2x=-294
=>2x=-294:2
x=147