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-3x-2(6x-12)=99
We move all terms to the left:
-3x-2(6x-12)-(99)=0
We multiply parentheses
-3x-12x+24-99=0
We add all the numbers together, and all the variables
-15x-75=0
We move all terms containing x to the left, all other terms to the right
-15x=75
x=75/-15
x=-5
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