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18=x+2.6x
We move all terms to the left:
18-(x+2.6x)=0
We add all the numbers together, and all the variables
-(+3.6x)+18=0
We get rid of parentheses
-3.6x+18=0
We move all terms containing x to the left, all other terms to the right
-3.6x=-18
x=-18/-3.6
x=+5
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