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x+(x+10)+3x=130
We move all terms to the left:
x+(x+10)+3x-(130)=0
We add all the numbers together, and all the variables
4x+(x+10)-130=0
We get rid of parentheses
4x+x+10-130=0
We add all the numbers together, and all the variables
5x-120=0
We move all terms containing x to the left, all other terms to the right
5x=120
x=120/5
x=24
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