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X+(X+1)=-55
We move all terms to the left:
X+(X+1)-(-55)=0
We add all the numbers together, and all the variables
X+(X+1)+55=0
We get rid of parentheses
X+X+1+55=0
We add all the numbers together, and all the variables
2X+56=0
We move all terms containing X to the left, all other terms to the right
2X=-56
X=-56/2
X=-28
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