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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
28/x = 36/27 // - 36/27
28/x-(36/27) = 0
28/x-4/3 = 0
28*x^-1 = 4/3 // : 28
x^-1 = 1/21
-1 < 0
1/(x^1) = 1/21 // * x^1
1 = 1/21*x^1 // : 1/21
21 = x^1
x = 21
x = 21
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