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x in (-oo:+oo)
5*x-((6/2)*x^2)-(50*x) = 0
5*x-3*x^2-50*x = 0
-3*x^2-45*x = 0
DELTA = (-45)^2-(-3*0*4)
DELTA = 2025
DELTA > 0
x = (2025^(1/2)+45)/(-3*2) or x = (45-2025^(1/2))/(-3*2)
x = -15 or x = 0
x in { -15, 0 }
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