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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
46/52 = 23/y // - 23/y
46/52-(23/y) = 0
46/52-23*y^-1 = 0
-23*y^-1 = -23/26 // : -23
y^-1 = 1/26
-1 < 0
1/(y^1) = 1/26 // * y^1
1 = 1/26*y^1 // : 1/26
26 = y^1
y = 26
y = 26
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