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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(y^1)/x-7 = 0
y/x-7 = 0
x^-1*y = 7 // : y
x^-1 = 7/y
-1 < 0
1/(x^1) = 7/y // * x^1
1 = x^1*(7/y) // : 7/y
1/(7/y) = x^1
x = 1/(7/y)
x = 1/(7/y)
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