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-7+13x=2+12x
We move all terms to the left:
-7+13x-(2+12x)=0
We add all the numbers together, and all the variables
13x-(12x+2)-7=0
We get rid of parentheses
13x-12x-2-7=0
We add all the numbers together, and all the variables
x-9=0
We move all terms containing x to the left, all other terms to the right
x=9
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