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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
6/y = 11/13 // - 11/13
6/y-(11/13) = 0
6/y-11/13 = 0
6*y^-1 = 11/13 // : 6
y^-1 = 11/78
-1 < 0
1/(y^1) = 11/78 // * y^1
1 = 11/78*y^1 // : 11/78
78/11 = y^1
y = 78/11
y = 78/11
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