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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
3/7 = 11/y // - 11/y
3/7-(11/y) = 0
3/7-11*y^-1 = 0
-11*y^-1 = -3/7 // : -11
y^-1 = 3/77
-1 < 0
1/(y^1) = 3/77 // * y^1
1 = 3/77*y^1 // : 3/77
77/3 = y^1
y = 77/3
y = 77/3
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