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(x+2)+(x-4)+(x+6)+(x-3)+(x+7)+(x-8)=720
We move all terms to the left:
(x+2)+(x-4)+(x+6)+(x-3)+(x+7)+(x-8)-(720)=0
We get rid of parentheses
x+x+x+x+x+x+2-4+6-3+7-8-720=0
We add all the numbers together, and all the variables
6x-720=0
We move all terms containing x to the left, all other terms to the right
6x=720
x=720/6
x=120
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