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