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X+2+12-X+4X-13=90
We move all terms to the left:
X+2+12-X+4X-13-(90)=0
We add all the numbers together, and all the variables
4X-89=0
We move all terms containing X to the left, all other terms to the right
4X=89
X=89/4
X=22+1/4
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