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-61.3333 = 6*x-((5/6)*x^2) // - 6*x-((5/6)*x^2)
(5/6)*x^2-(6*x)-61.3333 = 0
(5/6)*x^2-6*x-61.3333 = 0
5/6*x^2-6*x-61.3333 = 0
DELTA = (-6)^2-(-61.3333*5/6*4)
DELTA = 240.444332515556
DELTA > 0
x = (240.444332515556^(1/2)+6)/(5/6*2) or x = (6-240.444332515556^(1/2))/(5/6*2)
x = 3/5*(240.444332515556^(1/2)+6) or x = 3/5*(6-240.444332515556^(1/2))
x in { 3/5*(6-240.444332515556^(1/2)), 3/5*(240.444332515556^(1/2)+6) }
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