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x+(x+600)=2880
We move all terms to the left:
x+(x+600)-(2880)=0
We get rid of parentheses
x+x+600-2880=0
We add all the numbers together, and all the variables
2x-2280=0
We move all terms containing x to the left, all other terms to the right
2x=2280
x=2280/2
x=1140
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