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18=2x-6+x-3
We move all terms to the left:
18-(2x-6+x-3)=0
We add all the numbers together, and all the variables
-(3x-9)+18=0
We get rid of parentheses
-3x+9+18=0
We add all the numbers together, and all the variables
-3x+27=0
We move all terms containing x to the left, all other terms to the right
-3x=-27
x=-27/-3
x=+9
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