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80x+100(x-2)=340
We move all terms to the left:
80x+100(x-2)-(340)=0
We multiply parentheses
80x+100x-200-340=0
We add all the numbers together, and all the variables
180x-540=0
We move all terms containing x to the left, all other terms to the right
180x=540
x=540/180
x=3
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