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![](https://rs.olm.vn/images/avt/0.png?1311)
9-25=(7-x)-(25+7)
9-25=(7-x)-32
suy ra:(7-x)-32=9-25
(7-x)-32=-16
7-x=-16+32
7-x=16
x=7-16
x=-9
![](https://rs.olm.vn/images/avt/0.png?1311)
9 - 25 = (7 - x) - (25 + 7)
-16 = 7 - x - 32
7 - x - 32 = -16
7 - x = -16 + 32
7 - x = 16
x = 16 +7
x = 23
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\left(x-7\right)\left(x+2019\right)=0\)
\(\Rightarrow\orbr{\begin{cases}x-7=0\\x+2019=0\end{cases}}\Leftrightarrow\orbr{\begin{cases}x=7\\x=-2019\end{cases}}\)
\(9-25=\left(7-x\right)-\left(25+7\right)\)
\(\Leftrightarrow-16=7-x-25-7\)
\(\Leftrightarrow-x=-16+25\)
\(\Leftrightarrow-x=9\)
\(\Leftrightarrow x=-9\)
\(2\left(4x-2x\right)-7x=15\)
\(\Leftrightarrow4x-7x=15\)
\(\Leftrightarrow x=-5\)
a ) 9 - 25 = ( 7 - x ) - ( 25 + 7 )
9 - 25 = 7 - x - 25 - 7
9 - 25 - 7 + 25 + 7 = -x
9 = - x
=> x = -9
Vậy x = -9
b) 2 . ( 4x - 2x ) - 7x = 15
8x - 4x - 7x = 15
-3x = 15
x = 15 : ( - 3 )
x = -5
Vậy x = -5
c ) ( x - 7 ). ( x + 2019 ) = 0
=> x - 7 = 0 hoặc x + 2019 = 0
=> x = 7 hoặc x = - 2019
vậy x \(\in\){ 7 ; -2019 }
![](https://rs.olm.vn/images/avt/0.png?1311)
a) -x - 84=-16-213
-x-84=-229
-84+229=x
145 =x
b) /x+2/= 316
suy ra x+2=316 hoac x+2=-316
* x+2 = 316
x = 314
* x+2 =-316
x = -318
vay x=314 hoac x=-318
c) /x+7/=15
suy ra x+7=15 hoac x+7=-15
x+7=15
x = 8
x+7= -15
x = -22
vay x= 8 hoac x=-22
d) 19-4=/x-1/
15=/x-1/
suy ra x-1=15 hoac x-1=-15
x-1=15
x = 16
x-1=-15
x= -14
vay x=16 hoac x=-14
\(-\left(x+84\right)+213=-16\)
\(=>-x-84+213=-16\)
\(=>-x=-16+84-213=-145\)
\(=>x=145\)
\(\left|x+2\right|=341+\left(-25\right)\)
\(=>\left|x+2\right|=341-25=316\)
\(=>\orbr{\begin{cases}x+2=316\\x+2=-316\end{cases}}\)
\(=>\orbr{\begin{cases}x=314\\x=-318\end{cases}}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
a)-16=7-x-32=-25-x
x=-25+16=-9
b)x-25+x=x-15
2x-25=x-15
2x=x-15+25=x+10
x=10
c)14-27+13=x-3+14
0=x+11
x=-11
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 5 - x = 17 - (-5)
5 - x = 22
x = 5 - 22
x = - 17
Vậy x = -17
b) x - 12 = - 9 - (-15)
x - 12 = 6
x = 6 + 12
x = 18
Vậy x = 18
c) 9 + 25 = (-7-x) - ( 25 - 7 )
34 = (-7-x) - 18
hay (-7-x) - 18 = 34
-7-x = 34 + 18
-7-x = 52
x = -7 - 52
x = - 59
Vậy x = -59
d) 11 + (15-11) = x - (25 - 9)
11 + 4 = x - 16
15 = x - 16
hay x - 16 = 15
x = 15 + 16
x = 31
Vậy x = 31
Nhớ lời bn nói nha ^ ^
\(9-25=\left(7-x\right)-\left(25+7\right)\)
\(\Rightarrow7-x-25-7=-16\)
\(\Rightarrow-x=-16-7+25+7\)
\(\Rightarrow-x=9\Rightarrow x=-9\)
Vậy.............
Chúc bạn học tốt!!!