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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
10/11 = 7/y // - 7/y
10/11-(7/y) = 0
10/11-7*y^-1 = 0
-7*y^-1 = -10/11 // : -7
y^-1 = 10/77
-1 < 0
1/(y^1) = 10/77 // * y^1
1 = 10/77*y^1 // : 10/77
77/10 = y^1
y = 77/10
y = 77/10
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