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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
4/y = 13/17 // - 13/17
4/y-(13/17) = 0
4/y-13/17 = 0
4*y^-1 = 13/17 // : 4
y^-1 = 13/68
-1 < 0
1/(y^1) = 13/68 // * y^1
1 = 13/68*y^1 // : 13/68
68/13 = y^1
y = 68/13
y = 68/13
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