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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
12/y = 11/5 // - 11/5
12/y-(11/5) = 0
12/y-11/5 = 0
12*y^-1 = 11/5 // : 12
y^-1 = 11/60
-1 < 0
1/(y^1) = 11/60 // * y^1
1 = 11/60*y^1 // : 11/60
60/11 = y^1
y = 60/11
y = 60/11
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