Ta có: 5 (x - 6) - 2 (x + 3) = 12
=> 5x - 30 - 2x - 6 = 12
=> 3x - 36 = 12
=> 3x = 12 + 36 = 48
=> x = 48 : 3 = 16
Vậy x = 16
5.(x-6)-2.(x+3)=12
=>5x-30-2x-6=12
=>5x-3x=12+30+6
=>2x=48
=>x=48:2
=>x=24
mình giải theo cách lớp 8 nhé:
5(x-6) - 2(x+3)=12
5x-30-2x-6 = 12
3x-36 = 12
3x= 12+36
3x = 48
x=48:3
x=16
5(x-6)-2(x+3)=12=>5x-30-2x-6=12=>3x-36=12=>3(x-12)=12=>x-12=4=>x=16