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X-15=3X-4
We move all terms to the left:
X-15-(3X-4)=0
We get rid of parentheses
X-3X+4-15=0
We add all the numbers together, and all the variables
-2X-11=0
We move all terms containing X to the left, all other terms to the right
-2X=11
X=11/-2
X=-5+1/2
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