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x+(x+1)+(x+2)=900
We move all terms to the left:
x+(x+1)+(x+2)-(900)=0
We get rid of parentheses
x+x+x+1+2-900=0
We add all the numbers together, and all the variables
3x-897=0
We move all terms containing x to the left, all other terms to the right
3x=897
x=897/3
x=299
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