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-13+x-2=15-12+7
We move all terms to the left:
-13+x-2-(15-12+7)=0
We add all the numbers together, and all the variables
x-13-2-10=0
We add all the numbers together, and all the variables
x-25=0
We move all terms containing x to the left, all other terms to the right
x=25
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