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3x-12=6x-66
We move all terms to the left:
3x-12-(6x-66)=0
We get rid of parentheses
3x-6x+66-12=0
We add all the numbers together, and all the variables
-3x+54=0
We move all terms containing x to the left, all other terms to the right
-3x=-54
x=-54/-3
x=+18
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