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-9x/12=3
We move all terms to the left:
-9x/12-(3)=0
We multiply all the terms by the denominator
-9x-3*12=0
We add all the numbers together, and all the variables
-9x-36=0
We move all terms containing x to the left, all other terms to the right
-9x=36
x=36/-9
x=-4
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