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2(x)-100+x+3(x)+80=2680
We move all terms to the left:
2(x)-100+x+3(x)+80-(2680)=0
We add all the numbers together, and all the variables
6x-2700=0
We move all terms containing x to the left, all other terms to the right
6x=2700
x=2700/6
x=450
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