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3x=99x-12
We move all terms to the left:
3x-(99x-12)=0
We get rid of parentheses
3x-99x+12=0
We add all the numbers together, and all the variables
-96x+12=0
We move all terms containing x to the left, all other terms to the right
-96x=-12
x=-12/-96
x=1/8
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