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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3/x = 5184/1600 // - 5184/1600
3/x-(5184/1600) = 0
3/x-81/25 = 0
3*x^-1 = 81/25 // : 3
x^-1 = 27/25
-1 < 0
1/(x^1) = 27/25 // * x^1
1 = 27/25*x^1 // : 27/25
25/27 = x^1
x = 25/27
x = 25/27
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