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