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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
40/16 = 27/x // - 27/x
40/16-(27/x) = 0
40/16-27*x^-1 = 0
-27*x^-1 = -5/2 // : -27
x^-1 = 5/54
-1 < 0
1/(x^1) = 5/54 // * x^1
1 = 5/54*x^1 // : 5/54
54/5 = x^1
x = 54/5
x = 54/5
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