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-105+3X=9X+135
We move all terms to the left:
-105+3X-(9X+135)=0
We get rid of parentheses
3X-9X-135-105=0
We add all the numbers together, and all the variables
-6X-240=0
We move all terms containing X to the left, all other terms to the right
-6X=240
X=240/-6
X=-40
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