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18=13x-7x
We move all terms to the left:
18-(13x-7x)=0
We add all the numbers together, and all the variables
-(+6x)+18=0
We get rid of parentheses
-6x+18=0
We move all terms containing x to the left, all other terms to the right
-6x=-18
x=-18/-6
x=+3
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