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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
1/y = 2.8 // - 2.8
1/y-2.8 = 0
1*y^-1 = 2.8 // : 1
y^-1 = 2.8
-1 < 0
1/(y^1) = 2.8 // * y^1
1 = 2.8*y^1 // : 2.8
0.35714286 = y^1
y = 0.35714286
y = 0.35714286
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