Respuesta :
1: 3x+12=-5x-36
3x+5x=-12-36
8x=-48
x=-48/8
x=6
2: 5x+30=-5x+20
5x+5x=-30+20
10x=-10
x=.-10/10
x=-1
3:9x-54=4x+16
9x-4x=54+16
5x=70
x=70/5
x=14
3x+5x=-12-36
8x=-48
x=-48/8
x=6
2: 5x+30=-5x+20
5x+5x=-30+20
10x=-10
x=.-10/10
x=-1
3:9x-54=4x+16
9x-4x=54+16
5x=70
x=70/5
x=14