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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
45/a = 127 // - 127
45/a-127 = 0
45*a^-1 = 127 // : 45
a^-1 = 127/45
-1 < 0
1/(a^1) = 127/45 // * a^1
1 = 127/45*a^1 // : 127/45
45/127 = a^1
a = 45/127
a = 45/127
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