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X+X+1+X+2+X+3=-249
We move all terms to the left:
X+X+1+X+2+X+3-(-249)=0
We add all the numbers together, and all the variables
4X+255=0
We move all terms containing X to the left, all other terms to the right
4X=-255
X=-255/4
X=-63+3/4
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