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-5x-9=7x-117
We move all terms to the left:
-5x-9-(7x-117)=0
We get rid of parentheses
-5x-7x+117-9=0
We add all the numbers together, and all the variables
-12x+108=0
We move all terms containing x to the left, all other terms to the right
-12x=-108
x=-108/-12
x=+9
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