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(3*x^2)/3-(6*x) = 0
(3*x^2)/3-6*x = 0
x^2-6*x = 0
DELTA = (-6)^2-(0*1*4)
DELTA = 36
DELTA > 0
x = (36^(1/2)+6)/(1*2) or x = (6-36^(1/2))/(1*2)
x = 6 or x = 0
x in { 0, 6 }
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