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3x-3=6x+15
We move all terms to the left:
3x-3-(6x+15)=0
We get rid of parentheses
3x-6x-15-3=0
We add all the numbers together, and all the variables
-3x-18=0
We move all terms containing x to the left, all other terms to the right
-3x=18
x=18/-3
x=-6
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