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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
8/y = 4/7 // - 4/7
8/y-(4/7) = 0
8/y-4/7 = 0
8*y^-1 = 4/7 // : 8
y^-1 = 1/14
-1 < 0
1/(y^1) = 1/14 // * y^1
1 = 1/14*y^1 // : 1/14
14 = y^1
y = 14
y = 14
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