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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(4/5)*x-(2/x) = 3/10 // - 3/10
(4/5)*x-(2/x)-(3/10) = 0
(4/5)*x-2*x^-1-3/10 = 0
4/5*x^1-2*x^-1-3/10*x^0 = 0
(4/5*x^2-3/10*x^1-2*x^0)/(x^1) = 0 // * x^2
x^1*(4/5*x^2-3/10*x^1-2*x^0) = 0
x^1
(4/5)*x^2+(-3/10)*x-2 = 0
(4/5)*x^2+(-3/10)*x-2 = 0
DELTA = (-3/10)^2-(-2*4*(4/5))
DELTA = 649/100
DELTA > 0
x = ((649/100)^(1/2)-(-3/10))/(2*(4/5)) or x = (-(-3/10)-(649/100)^(1/2))/(2*(4/5))
x = 5/8*((649/100)^(1/2)+3/10) or x = 5/8*(3/10-(649/100)^(1/2))
x in { 5/8*(3/10-(649/100)^(1/2)), 5/8*((649/100)^(1/2)+3/10)}
x in { 5/8*(3/10-(649/100)^(1/2)), 5/8*((649/100)^(1/2)+3/10) }
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