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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
10/17 = 4/y // - 4/y
10/17-(4/y) = 0
10/17-4*y^-1 = 0
-4*y^-1 = -10/17 // : -4
y^-1 = 5/34
-1 < 0
1/(y^1) = 5/34 // * y^1
1 = 5/34*y^1 // : 5/34
34/5 = y^1
y = 34/5
y = 34/5
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