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