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12-(-3)x=54
We move all terms to the left:
12-(-3)x-(54)=0
We add all the numbers together, and all the variables
-(-3)x-42=0
We multiply parentheses
3x-42=0
We move all terms containing x to the left, all other terms to the right
3x=42
x=42/3
x=14
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