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(15/72)*x-x^2 = -25/12 // + -25/12
(15/72)*x-x^2-(-25/12) = 0
(15/72)*x-x^2+25/12 = 0
5/24*x-x^2+25/12 = 0
DELTA = (5/24)^2-(-1*25/12*4)
DELTA = 4825/576
DELTA > 0
x = ((4825/576)^(1/2)-5/24)/(-1*2) or x = (-(4825/576)^(1/2)-5/24)/(-1*2)
x = ((4825/576)^(1/2)-5/24)/(-2) or x = ((4825/576)^(1/2)+5/24)/2
x in { ((4825/576)^(1/2)-5/24)/(-2), ((4825/576)^(1/2)+5/24)/2 }
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