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18=11x-9x
We move all terms to the left:
18-(11x-9x)=0
We add all the numbers together, and all the variables
-(+2x)+18=0
We get rid of parentheses
-2x+18=0
We move all terms containing x to the left, all other terms to the right
-2x=-18
x=-18/-2
x=+9
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