100 - 7.(x - 5) = 58
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100 - 7 x (X - 5 ) = 58
100 - 7x + 35 = 58
7x = 135 - 58
7x = 77
x=11
100 - 7(X - 5) = 58
7(X - 5) = 42
X - 5 = 42 : 7 = 6
X = 6 + 5 = 11
![](https://rs.olm.vn/images/avt/0.png?1311)
100 - 7 . ( x - 5 ) = 58
7 . ( x - 5 ) = 100 - 58
7 . ( x - 5 ) = 42
( x - 5 ) = 42 : 7
( x - 5 ) = 6
x = 6 + 5
x = 11
100 - 7 x ( x - 5 ) = 58
7 x ( x - 5 ) = 100 - 58
7 x ( x - 5 ) = 42
x - 5 = 42 : 7
x - 5 = 6
x = 6 + 5
x = 11
![](https://rs.olm.vn/images/avt/0.png?1311)
100 - 7 . ( x - 5 ) = 58
93 . x - 5 = 58
x - 5 =93 : 58
x - 5 = 1.6
x = 1.6 +5
x = 6.6
100-7.(x-5)=58
7.(x-5)=100-58
7.(x-5)=42
x-5=42:7
x-5=7
x=7+5
x=12
vậy x=12
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a ) 100-7(x-5)=58
=> 7(x-5)=42
=.> x-5 = 6
=> x=11
180-5(x+1)=30
=> 5(x+1)=150
=> x+1=30\
=> x=29
6x-5=613
=> 6x=618
=> x=103
a) \(100-7\left(x-5\right)=58\)
\(\Leftrightarrow7\left(x-5\right)=42\)
\(\Leftrightarrow x-5=6\)
\(\Leftrightarrow x=11\)
b) \(180-5\left(x+1\right)=30\)
\(\Leftrightarrow5\left(x+1\right)=150\)
\(\Leftrightarrow x+1=30\)
\(\Leftrightarrow x=29\)
c) \(6x-5=613\)
\(\Leftrightarrow6x=618\)
\(\Leftrightarrow x=103\)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(a,565-\left(6x+70\right)=435\)
\(6x+70=565-435\)
\(6x+70=130\)
\(6x=130-70\)
\(6x=60\)
\(x=10\)
\(b,100-7\left(x-5\right)=58\)
\(100-7x+35=58\)
\(100-7x=58-35\)
\(100-7x=23\)
\(7x=100-23\)
\(7x=77\)
\(x=11\)
a, 565-(6x+70)=435
6x+70=565-435
6x+70=130
6x=130-70
6x=60
x=60:6
x=6
b, 100-7(x-5)=58
7(x-5)=100-58
7(x-5)=42
x-5=42:7
x-5=6
x=6+5
x=11
![](https://rs.olm.vn/images/avt/0.png?1311)
100 - 7 . (x - 5) = 58
7 . (x - 5) = 100 - 58
7 . (x - 5) = 42
(x - 5) = 42 : 7
(x - 5) = 6
x = 6 + 5
x = 11.
7.(x-5)=100-58
7.(x-5)=42
x-5=42:7
x-5=6
x=6+5
x=11