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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
30/y = 12 // - 12
30/y-12 = 0
30*y^-1 = 12 // : 30
y^-1 = 2/5
-1 < 0
1/(y^1) = 2/5 // * y^1
1 = 2/5*y^1 // : 2/5
5/2 = y^1
y = 5/2
y = 5/2
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