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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
(y+7)/y = 9/8 // - 9/8
(y+7)/y-(9/8) = 0
(y+7)/y-9/8 = 0
(8*(y+7))/(8*y)+(-9*y)/(8*y) = 0
8*(y+7)-9*y = 0
56-y = 0
(56-y)/(8*y) = 0
(56-y)/(8*y) = 0 // * 8*y
56-y = 0
56-y = 0 // - 56
-y = -56 // * -1
y = 56
y = 56
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