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