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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
10/y = 17/5 // - 17/5
10/y-(17/5) = 0
10/y-17/5 = 0
10*y^-1 = 17/5 // : 10
y^-1 = 17/50
-1 < 0
1/(y^1) = 17/50 // * y^1
1 = 17/50*y^1 // : 17/50
50/17 = y^1
y = 50/17
y = 50/17
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