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x+(3x+5)=13
We move all terms to the left:
x+(3x+5)-(13)=0
We get rid of parentheses
x+3x+5-13=0
We add all the numbers together, and all the variables
4x-8=0
We move all terms containing x to the left, all other terms to the right
4x=8
x=8/4
x=2
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