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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
80/y = 15/8 // - 15/8
80/y-(15/8) = 0
80/y-15/8 = 0
80*y^-1 = 15/8 // : 80
y^-1 = 3/128
-1 < 0
1/(y^1) = 3/128 // * y^1
1 = 3/128*y^1 // : 3/128
128/3 = y^1
y = 128/3
y = 128/3
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