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18=8x+x
We move all terms to the left:
18-(8x+x)=0
We add all the numbers together, and all the variables
-(+9x)+18=0
We get rid of parentheses
-9x+18=0
We move all terms containing x to the left, all other terms to the right
-9x=-18
x=-18/-9
x=+2
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