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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
3/2 = 20/y // - 20/y
3/2-(20/y) = 0
3/2-20*y^-1 = 0
-20*y^-1 = -3/2 // : -20
y^-1 = 3/40
-1 < 0
1/(y^1) = 3/40 // * y^1
1 = 3/40*y^1 // : 3/40
40/3 = y^1
y = 40/3
y = 40/3
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