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(3x+3)=13
We move all terms to the left:
(3x+3)-(13)=0
We get rid of parentheses
3x+3-13=0
We add all the numbers together, and all the variables
3x-10=0
We move all terms containing x to the left, all other terms to the right
3x=10
x=10/3
x=3+1/3
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