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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
12/y = 30/9 // - 30/9
12/y-(30/9) = 0
12/y-10/3 = 0
12*y^-1 = 10/3 // : 12
y^-1 = 5/18
-1 < 0
1/(y^1) = 5/18 // * y^1
1 = 5/18*y^1 // : 5/18
18/5 = y^1
y = 18/5
y = 18/5
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