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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
0.6/y = 2.3 // - 2.3
0.6/y-2.3 = 0
0.6*y^-1 = 2.3 // : 0.6
y^-1 = 3.83333333
-1 < 0
1/(y^1) = 3.83333333 // * y^1
1 = 3.83333333*y^1 // : 3.83333333
0.26086957 = y^1
y = 0.26086957
y = 0.26086957
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