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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
3/a-4 = 0
3*a^-1 = 4 // : 3
a^-1 = 4/3
-1 < 0
1/(a^1) = 4/3 // * a^1
1 = 4/3*a^1 // : 4/3
3/4 = a^1
a = 3/4
a = 3/4
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