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99=12x-x
We move all terms to the left:
99-(12x-x)=0
We add all the numbers together, and all the variables
-(+11x)+99=0
We get rid of parentheses
-11x+99=0
We move all terms containing x to the left, all other terms to the right
-11x=-99
x=-99/-11
x=+9
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