(-12)2 . x = 56 + 10 . 13 . x
=> 144 . x = 56+130 .x
=> 144x - 130x = 56
=>14x =56
=>4
(-12)2.x=56+10.13.x
=> 144.x=56+130.x
=> 144x-130x=56
=> x(144-130)=56
=> 14x=56
=> x=4
<=> 144 . x = 56 + 10 . 13x
<=> 144x = 56 + 130x
<=> 144x - 130x = 56
<=> 14x = 56
=> x = 56 : 14 = 4
Vậy x = 4
đúng 100%
144.x = 56+130.x
144.x+(-130)=56
14.x=56
x=56:14
x=4