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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
2.3-0.6/y = 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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