(-12)2.x = 56 + 10.13.x

144.x = 56 + 130.x

144x – 130 x = 56

14x = 56

x = 56: 14

x = 4

Vậy x = 4

12²-x = 56+10.13.x

144-x=56+130.x

144-x-130.x=56

14.x=56

x=56:14

x=4

(-12)^2.x =56+10.13.x 
144.x =56+130.x 
144.x-130.x =56 
14.x =56 
x=4 
Vậy x=4. 

\(\left(-12\right)^2.x=56+10.13.x\)

\(144.x=56+130.x\)

\(144.x-130.x=56\)

\(x.\left(144-130\right)=56\)

\(x.14=56\)

\(x=56:14\)

\(x=4\)

Vậy \(x=4\)

(-12 \(^2\)) . x = 56 + 10.13.x
144.x = 56 + 130.x
144.x - 130.x = 56
14x = 56
x = 56 : 14
x = 4
Vậy x = 4

:D

(-12)² . x= 56+10.13.x

x=12

(-12)²x = 56 + 10.13x

144x -130x = 56

14x = 56

=> x = 56/14 = 4

Vậy x =4

( -12 )² . x = 56 + 10.13 . x

144 . x = 56 + 130.x

56 + 130 . x = 144. x

130 . x = 144.x - 56

Ta thay lần lượt từ 1, 2, 3,...khi đó x = 4 

có gì sai để ko đó bạn chứ sao mà 144x=186x được chứ 

x=4

(-12)².x = 56 + 10.13.x

=> 144.x = 56 + 130.x

=> 144.x-130.x=56

=> 14.x=56

=> x=56:14

=> x=4

(-12)^2.x=56+10.13.x

=>144.x=56+130x

=>144x-130x=56

=>14x=56

=>x=56:14

=>x=4

(-12)².x =56+10.13.x

144.x=56+130.x

144.x-130.x=56

14.x=56

x=\(\frac{56}{14}\)

x=4

(-12)².x=56+10.13.x

144x=56+10.13x

144x=56+130x

144x-130x=56

14x=56

x=4

Ta có: \(\left(-12\right)^2.x=56+10.13.x\)

\(\Rightarrow144.x=56+130.x\)

\(\Rightarrow144x-56-130x=0\)

\(\Rightarrow144x-130x-56=0\)

\(\Rightarrow14x-56=0\)

\(\Rightarrow14x=56\)

\(\Rightarrow x=\frac{56}{14}=4\)

Vậy: \(x=4\)