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3x^2-16x-12=3x^2+4x-20x-12
We move all terms to the left:
3x^2-16x-12-(3x^2+4x-20x-12)=0
We get rid of parentheses
3x^2-3x^2-16x-4x+20x+12-12=0
We add all the numbers together, and all the variables
=0
x=0/1
x=0
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