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18x-18=7x+13
We move all terms to the left:
18x-18-(7x+13)=0
We get rid of parentheses
18x-7x-13-18=0
We add all the numbers together, and all the variables
11x-31=0
We move all terms containing x to the left, all other terms to the right
11x=31
x=31/11
x=2+9/11
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