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-15=3x-6x
We move all terms to the left:
-15-(3x-6x)=0
We add all the numbers together, and all the variables
-(-3x)-15=0
We get rid of parentheses
3x-15=0
We move all terms containing x to the left, all other terms to the right
3x=15
x=15/3
x=5
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