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(45/13)*x^2-(15*x) = 0
(45/13)*x^2-15*x = 0
45/13*x^2-15*x = 0
DELTA = (-15)^2-(0*45/13*4)
DELTA = 225
DELTA > 0
x = (225^(1/2)+15)/(2*45/13) or x = (15-225^(1/2))/(2*45/13)
x = 13/3 or x = 0
x in { 0, 13/3 }
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