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5*x-((5/6)*x^2) = 0
(-5/6)*x^2+5*x = 0
5*x-5/6*x^2 = 0
DELTA = 5^2-(-5/6*0*4)
DELTA = 25
DELTA > 0
x = (25^(1/2)-5)/(-5/6*2) or x = (-25^(1/2)-5)/(-5/6*2)
x = 0 or x = 6
x in { 0, 6 }
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