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