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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4*y = 3/x // - 3/x
4*y-(3/x) = 0
4*y-3*x^-1 = 0
-3*x^-1 = -(4*y) // : -3
x^-1 = (-4*y)/(-3)
-1 < 0
1/(x^1) = (-4*y)/(-3) // * x^1
1 = x^1*((-4*y)/(-3)) // : (-4*y)/(-3)
(3*y^-1)/4 = x^1
x = (3*y^-1)/4
x = (3*y^-1)/4
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