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x+(x+285)=2687
We move all terms to the left:
x+(x+285)-(2687)=0
We get rid of parentheses
x+x+285-2687=0
We add all the numbers together, and all the variables
2x-2402=0
We move all terms containing x to the left, all other terms to the right
2x=2402
x=2402/2
x=1201
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