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(6/3)*x^2+3*x = 0
2*x^2+3*x = 0
DELTA = 3^2-(0*2*4)
DELTA = 9
DELTA > 0
x = (9^(1/2)-3)/(2*2) or x = (-9^(1/2)-3)/(2*2)
x = 0 or x = -3/2
x in { -3/2, 0 }
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