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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5/x-((4/5)*x) = 5 // - 5
5/x-((4/5)*x)-5 = 0
(-4/5)*x+5/x-5 = 0
5*x^-1-4/5*x^1-5*x^0 = 0
(5*x^0-4/5*x^2-5*x^1)/(x^1) = 0 // * x^2
x^1*(5*x^0-4/5*x^2-5*x^1) = 0
x^1
(-4/5)*x^2-5*x+5 = 0
(-4/5)*x^2-5*x+5 = 0
DELTA = (-5)^2-(4*5*(-4/5))
DELTA = 41
DELTA > 0
x = (41^(1/2)+5)/(2*(-4/5)) or x = (5-41^(1/2))/(2*(-4/5))
x = -5/8*(41^(1/2)+5) or x = -5/8*(5-41^(1/2))
x in { -5/8*(41^(1/2)+5), -5/8*(5-41^(1/2))}
x in { -5/8*(41^(1/2)+5), -5/8*(5-41^(1/2)) }
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