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(91/60)*x^2-x-12 = 0
91/60*x^2-x-12 = 0
DELTA = (-1)^2-(-12*91/60*4)
DELTA = 369/5
DELTA > 0
x = ((369/5)^(1/2)+1)/(91/60*2) or x = (1-(369/5)^(1/2))/(91/60*2)
x = 30/91*((369/5)^(1/2)+1) or x = 30/91*(1-(369/5)^(1/2))
x in { 30/91*(1-(369/5)^(1/2)), 30/91*((369/5)^(1/2)+1) }
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