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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
56/x = 22 // - 22
56/x-22 = 0
56*x^-1 = 22 // : 56
x^-1 = 11/28
-1 < 0
1/(x^1) = 11/28 // * x^1
1 = 11/28*x^1 // : 11/28
28/11 = x^1
x = 28/11
x = 28/11
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