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(3x+2)+(x+8)=80
We move all terms to the left:
(3x+2)+(x+8)-(80)=0
We get rid of parentheses
3x+x+2+8-80=0
We add all the numbers together, and all the variables
4x-70=0
We move all terms containing x to the left, all other terms to the right
4x=70
x=70/4
x=17+1/2
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