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288 = (208/2)*x-((16/2)*x^2) // - (208/2)*x-((16/2)*x^2)
(16/2)*x^2-((208/2)*x)+288 = 0
(16/2)*x^2-104*x+288 = 0
8*x^2-104*x+288 = 0
DELTA = (-104)^2-(4*8*288)
DELTA = 1600
DELTA > 0
x = (1600^(1/2)+104)/(2*8) or x = (104-1600^(1/2))/(2*8)
x = 9 or x = 4
x in { 4, 9 }
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