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x-27=15-3x
We move all terms to the left:
x-27-(15-3x)=0
We add all the numbers together, and all the variables
x-(-3x+15)-27=0
We get rid of parentheses
x+3x-15-27=0
We add all the numbers together, and all the variables
4x-42=0
We move all terms containing x to the left, all other terms to the right
4x=42
x=42/4
x=10+1/2
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