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12+8x=57+5x
We move all terms to the left:
12+8x-(57+5x)=0
We add all the numbers together, and all the variables
8x-(5x+57)+12=0
We get rid of parentheses
8x-5x-57+12=0
We add all the numbers together, and all the variables
3x-45=0
We move all terms containing x to the left, all other terms to the right
3x=45
x=45/3
x=15
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