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108=13x-9
We move all terms to the left:
108-(13x-9)=0
We get rid of parentheses
-13x+9+108=0
We add all the numbers together, and all the variables
-13x+117=0
We move all terms containing x to the left, all other terms to the right
-13x=-117
x=-117/-13
x=+9
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