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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
2/y = 6/10 // - 6/10
2/y-(6/10) = 0
2/y-3/5 = 0
2*y^-1 = 3/5 // : 2
y^-1 = 3/10
-1 < 0
1/(y^1) = 3/10 // * y^1
1 = 3/10*y^1 // : 3/10
10/3 = y^1
y = 10/3
y = 10/3
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