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(2x-100)+(3x+80)=2680
We move all terms to the left:
(2x-100)+(3x+80)-(2680)=0
We get rid of parentheses
2x+3x-100+80-2680=0
We add all the numbers together, and all the variables
5x-2700=0
We move all terms containing x to the left, all other terms to the right
5x=2700
x=2700/5
x=540
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