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3+7x=3x-13
We move all terms to the left:
3+7x-(3x-13)=0
We get rid of parentheses
7x-3x+13+3=0
We add all the numbers together, and all the variables
4x+16=0
We move all terms containing x to the left, all other terms to the right
4x=-16
x=-16/4
x=-4
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