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(11/19)*x^2-((9/19)*x)-(5/19) = 0
(11/19)*x^2+(-9/19)*x-5/19 = 0
11/19*x^2-9/19*x-5/19 = 0
DELTA = (-9/19)^2-(-5/19*11/19*4)
DELTA = 301/361
DELTA > 0
x = ((301/361)^(1/2)+9/19)/(11/19*2) or x = (9/19-(301/361)^(1/2))/(11/19*2)
x = 19/22*((301/361)^(1/2)+9/19) or x = 19/22*(9/19-(301/361)^(1/2))
x in { 19/22*(9/19-(301/361)^(1/2)), 19/22*((301/361)^(1/2)+9/19) }
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