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(5/2)*x^2-((3/4)*x) = 0
(5/2)*x^2+(-3/4)*x = 0
5/2*x^2-3/4*x = 0
DELTA = (-3/4)^2-(0*5/2*4)
DELTA = 9/16
DELTA > 0
x = ((9/16)^(1/2)+3/4)/(2*5/2) or x = (3/4-(9/16)^(1/2))/(2*5/2)
x = 3/10 or x = 0
x in { 0, 3/10 }
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