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-13+3x=-4x+36
We move all terms to the left:
-13+3x-(-4x+36)=0
We get rid of parentheses
3x+4x-36-13=0
We add all the numbers together, and all the variables
7x-49=0
We move all terms containing x to the left, all other terms to the right
7x=49
x=49/7
x=7
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