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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
1/y = 8/13 // - 8/13
1/y-(8/13) = 0
1/y-8/13 = 0
1*y^-1 = 8/13 // : 1
y^-1 = 8/13
-1 < 0
1/(y^1) = 8/13 // * y^1
1 = 8/13*y^1 // : 8/13
13/8 = y^1
y = 13/8
y = 13/8
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