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-x+(-x+1)+(-x+2)=-276
We move all terms to the left:
-x+(-x+1)+(-x+2)-(-276)=0
We add all the numbers together, and all the variables
-x+(-1x+1)+(-1x+2)-(-276)=0
We add all the numbers together, and all the variables
-1x+(-1x+1)+(-1x+2)+276=0
We get rid of parentheses
-1x-1x-1x+1+2+276=0
We add all the numbers together, and all the variables
-3x+279=0
We move all terms containing x to the left, all other terms to the right
-3x=-279
x=-279/-3
x=+93
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