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X+39=6X+84
We move all terms to the left:
X+39-(6X+84)=0
We get rid of parentheses
X-6X-84+39=0
We add all the numbers together, and all the variables
-5X-45=0
We move all terms containing X to the left, all other terms to the right
-5X=45
X=45/-5
X=-9
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