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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5*x = 3/x-2 // - 3/x-2
5*x-(3/x)+2 = 0
5*x-3*x^-1+2 = 0
5*x^1-3*x^-1+2*x^0 = 0
(5*x^2+2*x^1-3*x^0)/(x^1) = 0 // * x^2
x^1*(5*x^2+2*x^1-3*x^0) = 0
x^1
5*x^2+2*x-3 = 0
5*x^2+2*x-3 = 0
DELTA = 2^2-(-3*4*5)
DELTA = 64
DELTA > 0
x = (64^(1/2)-2)/(2*5) or x = (-64^(1/2)-2)/(2*5)
x = 3/5 or x = -1
x in { -1, 3/5}
x in { -1, 3/5 }
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