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