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12-9x=57-3x
We move all terms to the left:
12-9x-(57-3x)=0
We add all the numbers together, and all the variables
-9x-(-3x+57)+12=0
We get rid of parentheses
-9x+3x-57+12=0
We add all the numbers together, and all the variables
-6x-45=0
We move all terms containing x to the left, all other terms to the right
-6x=45
x=45/-6
x=-7+1/2
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