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23x-93+9x+99-12x=99-12x+x
We move all terms to the left:
23x-93+9x+99-12x-(99-12x+x)=0
We add all the numbers together, and all the variables
23x+9x-12x-(-11x+99)-93+99=0
We add all the numbers together, and all the variables
20x-(-11x+99)+6=0
We get rid of parentheses
20x+11x-99+6=0
We add all the numbers together, and all the variables
31x-93=0
We move all terms containing x to the left, all other terms to the right
31x=93
x=93/31
x=3
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