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27=12x-13x
We move all terms to the left:
27-(12x-13x)=0
We add all the numbers together, and all the variables
-(-1x)+27=0
We get rid of parentheses
1x+27=0
We add all the numbers together, and all the variables
x+27=0
We move all terms containing x to the left, all other terms to the right
x=-27
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