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3x-15=4x+6
We move all terms to the left:
3x-15-(4x+6)=0
We get rid of parentheses
3x-4x-6-15=0
We add all the numbers together, and all the variables
-1x-21=0
We move all terms containing x to the left, all other terms to the right
-x=21
x=21/-1
x=-21
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