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X-15=4X-6
We move all terms to the left:
X-15-(4X-6)=0
We get rid of parentheses
X-4X+6-15=0
We add all the numbers together, and all the variables
-3X-9=0
We move all terms containing X to the left, all other terms to the right
-3X=9
X=9/-3
X=-3
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