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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
10 = y/x // - y/x
10-(y/x) = 0
x^-1*(-y) = -10 // : -y
x^-1 = 10/y
-1 < 0
1/(x^1) = 10/y // * x^1
1 = x^1*(10/y) // : 10/y
1/(10/y) = x^1
x = 1/(10/y)
x = 1/(10/y)
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