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10*x^2-((5/6)*x)-25 = 0
10*x^2+(-5/6)*x-25 = 0
10*x^2-5/6*x-25 = 0
DELTA = (-5/6)^2-(-25*4*10)
DELTA = 36025/36
DELTA > 0
x = ((36025/36)^(1/2)+5/6)/(2*10) or x = (5/6-(36025/36)^(1/2))/(2*10)
x = ((36025/36)^(1/2)+5/6)/20 or x = (5/6-(36025/36)^(1/2))/20
x in { (5/6-(36025/36)^(1/2))/20, ((36025/36)^(1/2)+5/6)/20 }
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