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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
16/20 = 6/y // - 6/y
16/20-(6/y) = 0
16/20-6*y^-1 = 0
-6*y^-1 = -4/5 // : -6
y^-1 = 2/15
-1 < 0
1/(y^1) = 2/15 // * y^1
1 = 2/15*y^1 // : 2/15
15/2 = y^1
y = 15/2
y = 15/2
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