Answer:
x = -12
Step-by-step explanation:
-36 + (-3x) = 0
___________
+36. +36
(add; addition poe)
______________
-3x = 36
_______
÷3 ÷3
(divide; division poe)
-x = 12
______
×÷-1 ×÷-1
(multiply or divide by negative one to cancel out the negative; identity)
