Respuesta :

mybiasisyoongi

Answer:

×=-11

Step-by-step explanation:

3x+21=-12

3×=-33

×=-11

dorianlynman

Answer:

x=-11

x+7=-4

Step-by-step explanation:

3(x+7)=-12

3x+21=-12

3x=-12-21

3x=-33

x=-33/3

x=-11

-11+7=-4