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(x+10)+(3x+10)=80
We move all terms to the left:
(x+10)+(3x+10)-(80)=0
We get rid of parentheses
x+3x+10+10-80=0
We add all the numbers together, and all the variables
4x-60=0
We move all terms containing x to the left, all other terms to the right
4x=60
x=60/4
x=15
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