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3x+57=6x-12
We move all terms to the left:
3x+57-(6x-12)=0
We get rid of parentheses
3x-6x+12+57=0
We add all the numbers together, and all the variables
-3x+69=0
We move all terms containing x to the left, all other terms to the right
-3x=-69
x=-69/-3
x=+23
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