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-18+27x=42x-63x
We move all terms to the left:
-18+27x-(42x-63x)=0
We add all the numbers together, and all the variables
27x-(-21x)-18=0
We get rid of parentheses
27x+21x-18=0
We add all the numbers together, and all the variables
48x-18=0
We move all terms containing x to the left, all other terms to the right
48x=18
x=18/48
x=3/8
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