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