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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
3/y+2 = 8 // - 8
3/y-8+2 = 0
3*y^-1 = 6 // : 3
y^-1 = 2
-1 < 0
1/(y^1) = 2 // * y^1
1 = 2*y^1 // : 2
1/2 = y^1
y = 1/2
y = 1/2
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