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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/x-(1/y) = 11 // - 11
1/x-(1/y)-11 = 0
1/x-y^-1-11 = 0
1*x^-1 = -(-y^-1-11) // : 1
x^-1 = y^-1+11
-1 < 0
1/(x^1) = y^-1+11 // * x^1
1 = x^1*(y^-1+11) // : y^-1+11
1/(y^-1+11) = x^1
x = 1/(y^-1+11)
x = 1/(y^-1+11)
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