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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
275/x = 5.5 // - 5.5
275/x-5.5 = 0
275*x^-1 = 5.5 // : 275
x^-1 = 0.02
-1 < 0
1/(x^1) = 0.02 // * x^1
1 = 0.02*x^1 // : 0.02
50 = x^1
x = 50
x = 50
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