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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(3/35)*x = 9/x-(5/7) // - 9/x-(5/7)
(3/35)*x-(9/x)+5/7 = 0
(3/35)*x-9*x^-1+5/7 = 0
3/35*x^1-9*x^-1+5/7*x^0 = 0
(3/35*x^2+5/7*x^1-9*x^0)/(x^1) = 0 // * x^2
x^1*(3/35*x^2+5/7*x^1-9*x^0) = 0
x^1
(3/35)*x^2+(5/7)*x-9 = 0
(3/35)*x^2+(5/7)*x-9 = 0
DELTA = (5/7)^2-(-9*4*(3/35))
DELTA = 881/245
DELTA > 0
x = ((881/245)^(1/2)-(5/7))/(2*(3/35)) or x = (-(5/7)-(881/245)^(1/2))/(2*(3/35))
x = 35/6*((881/245)^(1/2)-5/7) or x = -35/6*((881/245)^(1/2)+5/7)
x in { -35/6*((881/245)^(1/2)+5/7), 35/6*((881/245)^(1/2)-5/7)}
x in { -35/6*((881/245)^(1/2)+5/7), 35/6*((881/245)^(1/2)-5/7) }
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