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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
10/y+3 = 16-2 // - 16-2
10/y-16+2+3 = 0
10*y^-1 = 11 // : 10
y^-1 = 11/10
-1 < 0
1/(y^1) = 11/10 // * y^1
1 = 11/10*y^1 // : 11/10
10/11 = y^1
y = 10/11
y = 10/11
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