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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
5/y = 1.6 // - 1.6
5/y-1.6 = 0
5*y^-1 = 1.6 // : 5
y^-1 = 0.32
-1 < 0
1/(y^1) = 0.32 // * y^1
1 = 0.32*y^1 // : 0.32
3.125 = y^1
y = 3.125
y = 3.125
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