X+(x-1)+(x-2)=-87

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Solution for X+(x-1)+(x-2)=-87 equation: 



X+(X-1)+(X-2)=-87

We move all terms to the left:

X+(X-1)+(X-2)-(-87)=0

We add all the numbers together, and all the variables

X+(X-1)+(X-2)+87=0

We get rid of parentheses

X+X+X-1-2+87=0

We add all the numbers together, and all the variables

3X+84=0

We move all terms containing X to the left, all other terms to the right

3X=-84

X=-84/3

X=-28

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