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-12x+7=13x-18
We move all terms to the left:
-12x+7-(13x-18)=0
We get rid of parentheses
-12x-13x+18+7=0
We add all the numbers together, and all the variables
-25x+25=0
We move all terms containing x to the left, all other terms to the right
-25x=-25
x=-25/-25
x=1
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