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x+(x+1)+(x+2)=-18
We move all terms to the left:
x+(x+1)+(x+2)-(-18)=0
We add all the numbers together, and all the variables
x+(x+1)+(x+2)+18=0
We get rid of parentheses
x+x+x+1+2+18=0
We add all the numbers together, and all the variables
3x+21=0
We move all terms containing x to the left, all other terms to the right
3x=-21
x=-21/3
x=-7
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