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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
22/x = 11/20 // - 11/20
22/x-(11/20) = 0
22/x-11/20 = 0
22*x^-1 = 11/20 // : 22
x^-1 = 1/40
-1 < 0
1/(x^1) = 1/40 // * x^1
1 = 1/40*x^1 // : 1/40
40 = x^1
x = 40
x = 40
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