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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
8/y = 13/7 // - 13/7
8/y-(13/7) = 0
8/y-13/7 = 0
8*y^-1 = 13/7 // : 8
y^-1 = 13/56
-1 < 0
1/(y^1) = 13/56 // * y^1
1 = 13/56*y^1 // : 13/56
56/13 = y^1
y = 56/13
y = 56/13
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