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x+(x+7)+(3x+13)=180
We move all terms to the left:
x+(x+7)+(3x+13)-(180)=0
We get rid of parentheses
x+x+3x+7+13-180=0
We add all the numbers together, and all the variables
5x-160=0
We move all terms containing x to the left, all other terms to the right
5x=160
x=160/5
x=32
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