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39=-x-12
We move all terms to the left:
39-(-x-12)=0
We add all the numbers together, and all the variables
-(-1x-12)+39=0
We get rid of parentheses
1x+12+39=0
We add all the numbers together, and all the variables
x+51=0
We move all terms containing x to the left, all other terms to the right
x=-51
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