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