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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
9/x-5 = (7/2)*x // - (7/2)*x
9/x-((7/2)*x)-5 = 0
(-7/2)*x+9/x-5 = 0
9*x^-1-7/2*x^1-5*x^0 = 0
(9*x^0-7/2*x^2-5*x^1)/(x^1) = 0 // * x^2
x^1*(9*x^0-7/2*x^2-5*x^1) = 0
x^1
(-7/2)*x^2-5*x+9 = 0
(-7/2)*x^2-5*x+9 = 0
DELTA = (-5)^2-(4*9*(-7/2))
DELTA = 151
DELTA > 0
x = (151^(1/2)+5)/(2*(-7/2)) or x = (5-151^(1/2))/(2*(-7/2))
x = (151^(1/2)+5)/(-7) or x = (5-151^(1/2))/(-7)
x in { (151^(1/2)+5)/(-7), (5-151^(1/2))/(-7)}
x in { (151^(1/2)+5)/(-7), (5-151^(1/2))/(-7) }
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