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X=142X+9
We move all terms to the left:
X-(142X+9)=0
We get rid of parentheses
X-142X-9=0
We add all the numbers together, and all the variables
-141X-9=0
We move all terms containing X to the left, all other terms to the right
-141X=9
X=9/-141
X=-3/47
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