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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
3/y = 4/10 // - 4/10
3/y-(4/10) = 0
3/y-2/5 = 0
3*y^-1 = 2/5 // : 3
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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