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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
13/y = 10/12 // - 10/12
13/y-(10/12) = 0
13/y-5/6 = 0
13*y^-1 = 5/6 // : 13
y^-1 = 5/78
-1 < 0
1/(y^1) = 5/78 // * y^1
1 = 5/78*y^1 // : 5/78
78/5 = y^1
y = 78/5
y = 78/5
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