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3+3x=7x-13
We move all terms to the left:
3+3x-(7x-13)=0
We get rid of parentheses
3x-7x+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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