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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/x-(8/7) = (2/5)*x // - (2/5)*x
1/x-((2/5)*x)-(8/7) = 0
(-2/5)*x+1/x-8/7 = 0
1*x^-1-2/5*x^1-8/7*x^0 = 0
(1*x^0-2/5*x^2-8/7*x^1)/(x^1) = 0 // * x^2
x^1*(1*x^0-2/5*x^2-8/7*x^1) = 0
x^1
(-2/5)*x^2+(-8/7)*x+1 = 0
(-2/5)*x^2+(-8/7)*x+1 = 0
DELTA = (-8/7)^2-(1*4*(-2/5))
DELTA = 712/245
DELTA > 0
x = ((712/245)^(1/2)-(-8/7))/(2*(-2/5)) or x = (-(-8/7)-(712/245)^(1/2))/(2*(-2/5))
x = -5/4*((712/245)^(1/2)+8/7) or x = -5/4*(8/7-(712/245)^(1/2))
x in { -5/4*((712/245)^(1/2)+8/7), -5/4*(8/7-(712/245)^(1/2))}
x in { -5/4*((712/245)^(1/2)+8/7), -5/4*(8/7-(712/245)^(1/2)) }
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