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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
17/8 = 3/y // - 3/y
17/8-(3/y) = 0
17/8-3*y^-1 = 0
-3*y^-1 = -17/8 // : -3
y^-1 = 17/24
-1 < 0
1/(y^1) = 17/24 // * y^1
1 = 17/24*y^1 // : 17/24
24/17 = y^1
y = 24/17
y = 24/17
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