Respuesta :
Answer:
x = -1
Step-by-step explanation:
-3 +12 = 9
-9x = 9
-9(-1)=9
9 - 12 = -3
-9x-12=-3
Multiply by -1
9x+12=3
Divide by 3
3x+4=1
Subtract 4
3x=-3
Divide by 3
x=-1
Multiply by -1
9x+12=3
Divide by 3
3x+4=1
Subtract 4
3x=-3
Divide by 3
x=-1