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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
y/x = 73 // - 73
y/x-73 = 0
x^-1*y = 73 // : y
x^-1 = 73/y
-1 < 0
1/(x^1) = 73/y // * x^1
1 = x^1*(73/y) // : 73/y
1/(73/y) = x^1
x = 1/(73/y)
x = 1/(73/y)
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