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111=39-2x
We move all terms to the left:
111-(39-2x)=0
We add all the numbers together, and all the variables
-(-2x+39)+111=0
We get rid of parentheses
2x-39+111=0
We add all the numbers together, and all the variables
2x+72=0
We move all terms containing x to the left, all other terms to the right
2x=-72
x=-72/2
x=-36
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