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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
66/55 = 55/x // - 55/x
66/55-(55/x) = 0
66/55-55*x^-1 = 0
-55*x^-1 = -6/5 // : -55
x^-1 = 6/275
-1 < 0
1/(x^1) = 6/275 // * x^1
1 = 6/275*x^1 // : 6/275
275/6 = x^1
x = 275/6
x = 275/6
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