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