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Answer:
-5
Step-by-step explanation:
-5x + 12 + x = -4x + 12
Combine like terms:
( -5x + x ) + 12 = -4x + 12
-4x + 12 = -4x + 12
Subtract 12 from each side:
-4x = -4x
Ad 4x to each side:
0 = 0
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