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