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15=-3x+3-3x
We move all terms to the left:
15-(-3x+3-3x)=0
We add all the numbers together, and all the variables
-(-6x+3)+15=0
We get rid of parentheses
6x-3+15=0
We add all the numbers together, and all the variables
6x+12=0
We move all terms containing x to the left, all other terms to the right
6x=-12
x=-12/6
x=-2
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