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