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X+9=40X+18
We move all terms to the left:
X+9-(40X+18)=0
We get rid of parentheses
X-40X-18+9=0
We add all the numbers together, and all the variables
-39X-9=0
We move all terms containing X to the left, all other terms to the right
-39X=9
X=9/-39
X=-3/13
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