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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
12/y = 17/y-8 // - 17/y-8
12/y-(17/y)+8 = 0
12/y-17*y^-1+8 = 0
-5*y^-1 = -8 // : -5
y^-1 = 8/5
-1 < 0
1/(y^1) = 8/5 // * y^1
1 = 8/5*y^1 // : 8/5
5/8 = y^1
y = 5/8
y = 5/8
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