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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
8/10 = 16/y // - 16/y
8/10-(16/y) = 0
8/10-16*y^-1 = 0
-16*y^-1 = -4/5 // : -16
y^-1 = 1/20
-1 < 0
1/(y^1) = 1/20 // * y^1
1 = 1/20*y^1 // : 1/20
20 = y^1
y = 20
y = 20
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