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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
8.5/y = 17/15 // - 17/15
8.5/y-(17/15) = 0
8.5/y-17/15 = 0
8.5*y^-1 = 17/15 // : 8.5
y^-1 = 0.13333333
-1 < 0
1/(y^1) = 0.13333333 // * y^1
1 = 0.13333333*y^1 // : 0.13333333
7.50000019 = y^1
y = 7.50000019
y = 7.50000019
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