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13x-18=7x-54
We move all terms to the left:
13x-18-(7x-54)=0
We get rid of parentheses
13x-7x+54-18=0
We add all the numbers together, and all the variables
6x+36=0
We move all terms containing x to the left, all other terms to the right
6x=-36
x=-36/6
x=-6
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