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x+2x+(2x+5)=135
We move all terms to the left:
x+2x+(2x+5)-(135)=0
We add all the numbers together, and all the variables
3x+(2x+5)-135=0
We get rid of parentheses
3x+2x+5-135=0
We add all the numbers together, and all the variables
5x-130=0
We move all terms containing x to the left, all other terms to the right
5x=130
x=130/5
x=26
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