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x+(3x-13)=139
We move all terms to the left:
x+(3x-13)-(139)=0
We get rid of parentheses
x+3x-13-139=0
We add all the numbers together, and all the variables
4x-152=0
We move all terms containing x to the left, all other terms to the right
4x=152
x=152/4
x=38
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