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(2x+10)+(3x+10)+(4x+10)=120
We move all terms to the left:
(2x+10)+(3x+10)+(4x+10)-(120)=0
We get rid of parentheses
2x+3x+4x+10+10+10-120=0
We add all the numbers together, and all the variables
9x-90=0
We move all terms containing x to the left, all other terms to the right
9x=90
x=90/9
x=10
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