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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
88/y = 4 // - 4
88/y-4 = 0
88*y^-1 = 4 // : 88
y^-1 = 1/22
-1 < 0
1/(y^1) = 1/22 // * y^1
1 = 1/22*y^1 // : 1/22
22 = y^1
y = 22
y = 22
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