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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6/x = 5/4 // - 5/4
6/x-(5/4) = 0
6/x-5/4 = 0
6*x^-1 = 5/4 // : 6
x^-1 = 5/24
-1 < 0
1/(x^1) = 5/24 // * x^1
1 = 5/24*x^1 // : 5/24
24/5 = x^1
x = 24/5
x = 24/5
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