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![](https://rs.olm.vn/images/avt/0.png?1311)
=> 26 - 3x = 75 - 71
<=> 26 - 3x = 4
<=> 22 = 3x
<=> x = \(\dfrac{22}{3}\)
Vậy ...
![](https://rs.olm.vn/images/avt/0.png?1311)
71 + ( 26 - 3 . x ) ; 5 = 75
( 26 - 3x ) : 5 = 75 - 71
( 26 - 3x ) : 5 = 4
26 - 3x = 4.5
26 - 3x = 20
3x = 26 - 20
3x = 6
x = 6 : 3
x = 2
71+(26-3.x):5=75
71+(26-3x)=75.5=375
26-3x=375-71=304
3x=26-304=-278
x=\(\frac{-278}{3}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
d) 71 + (26 – 3x) : 5 = 75
(26 – 3x) : 5 = 75 – 71
(26 – 3x) : 5 = 4
26 – 3x = 4 . 5
26 – 3x = 20
3x = 26 – 20
3x = 6
x = 6 : 3 = 2
Vậy x = 2
![](https://rs.olm.vn/images/avt/0.png?1311)
( 26 - 3x ) : 5 = 75 - 71
( 26 - 3x ) : 5 = 4
26 - 3x = 4 x 5
26 - 3x = 20
3x = 26 - 20
3x = 6
x = 6 : 3
x = 2
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\left(26-3x\right):5+71=75\)
\(\left(26-3x\right):5=4\)
\(26-3x=20\)
\(3x=6\)
\(x=2\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\left(26-3x\right):5+71=75\)
\(\left(26-3x\right):5=4\)
\(26-3x=20\)
\(3x=6\)
\(x=2\)
\(5^{x+1}=125\)
\(5^{x-1}=5^3\)
\(\Rightarrow x-1=3\)
\(\Rightarrow x=4\)
\(\left(26-3x\right):5+71=75\)
\(\Rightarrow\left(26-3x\right)=\left(75-71\right).5\)
\(\Rightarrow26-3x=20\)
\(\Rightarrow x=2\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(-x-71+75=71+75-70\)
\(\Leftrightarrow-x=71+75-70-75+71\)
\(\Leftrightarrow-x=72\)
\(\Leftrightarrow x=-72\)
Vậy...........
Học hành chăm chỉ nha:0
- x - 71 + 75 = 71 + 75 - 70
=> -x = 71 + 71 + 75 - 75 - 70
=> -x = 72
=> x = -72
HOKK TỐTT