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x+(x+10)+4x=140
We move all terms to the left:
x+(x+10)+4x-(140)=0
We add all the numbers together, and all the variables
5x+(x+10)-140=0
We get rid of parentheses
5x+x+10-140=0
We add all the numbers together, and all the variables
6x-130=0
We move all terms containing x to the left, all other terms to the right
6x=130
x=130/6
x=21+2/3
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