=>(-12x)-(-60)+21-7x=5
=>(-12x)+60+21-7x=5
=>(-12x-7x)=5-(60+21)=-76
=>(-19x)=-76=>x=4
Vậy x=4
-12(x-5)+7(3-x)=5
-12.x+12.5+7.3-7.x
-19x+60+21=5
-19x=-76
x=-76:(-19)=4
Vậy x=4
-12(x-5) + 7(3-x) =5
( -12x + 60) + ( 21 - 7x) = 5
-12x + 60 + 21 - 7x = 5
-19x + 81 = 5
-19x = 76
x = -4