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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
13/y = 2/8 // - 2/8
13/y-(2/8) = 0
13/y-1/4 = 0
13*y^-1 = 1/4 // : 13
y^-1 = 1/52
-1 < 0
1/(y^1) = 1/52 // * y^1
1 = 1/52*y^1 // : 1/52
52 = y^1
y = 52
y = 52
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