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x+2(x-7)=13
We move all terms to the left:
x+2(x-7)-(13)=0
We multiply parentheses
x+2x-14-13=0
We add all the numbers together, and all the variables
3x-27=0
We move all terms containing x to the left, all other terms to the right
3x=27
x=27/3
x=9
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