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X+7+X-3+2X+11=45
We move all terms to the left:
X+7+X-3+2X+11-(45)=0
We add all the numbers together, and all the variables
4X-30=0
We move all terms containing X to the left, all other terms to the right
4X=30
X=30/4
X=7+1/2
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