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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
4/y = 17/8 // - 17/8
4/y-(17/8) = 0
4/y-17/8 = 0
4*y^-1 = 17/8 // : 4
y^-1 = 17/32
-1 < 0
1/(y^1) = 17/32 // * y^1
1 = 17/32*y^1 // : 17/32
32/17 = y^1
y = 32/17
y = 32/17
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