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3x-99=8x+9
We move all terms to the left:
3x-99-(8x+9)=0
We get rid of parentheses
3x-8x-9-99=0
We add all the numbers together, and all the variables
-5x-108=0
We move all terms containing x to the left, all other terms to the right
-5x=108
x=108/-5
x=-21+3/5
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