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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(5/7)*x+1/x+9 = 0
5/7*x^1+1*x^-1+9*x^0 = 0
(5/7*x^2+9*x^1+1*x^0)/(x^1) = 0 // * x^2
x^1*(5/7*x^2+9*x^1+1*x^0) = 0
x^1
(5/7)*x^2+9*x+1 = 0
(5/7)*x^2+9*x+1 = 0
DELTA = 9^2-(1*4*(5/7))
DELTA = 547/7
DELTA > 0
x = ((547/7)^(1/2)-9)/(2*(5/7)) or x = (-(547/7)^(1/2)-9)/(2*(5/7))
x = 7/10*((547/7)^(1/2)-9) or x = -7/10*((547/7)^(1/2)+9)
x in { -7/10*((547/7)^(1/2)+9), 7/10*((547/7)^(1/2)-9)}
x in { -7/10*((547/7)^(1/2)+9), 7/10*((547/7)^(1/2)-9) }
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