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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
22/x = 2.8 // - 2.8
22/x-2.8 = 0
22*x^-1 = 2.8 // : 22
x^-1 = 0.12727273
-1 < 0
1/(x^1) = 0.12727273 // * x^1
1 = 0.12727273*x^1 // : 0.12727273
7.85714269 = x^1
x = 7.85714269
x = 7.85714269
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