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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3/x = 5/4 // - 5/4
3/x-(5/4) = 0
3/x-5/4 = 0
3*x^-1 = 5/4 // : 3
x^-1 = 5/12
-1 < 0
1/(x^1) = 5/12 // * x^1
1 = 5/12*x^1 // : 5/12
12/5 = x^1
x = 12/5
x = 12/5
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