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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
1/a = 6/8 // - 6/8
1/a-(6/8) = 0
1/a-3/4 = 0
1*a^-1 = 3/4 // : 1
a^-1 = 3/4
-1 < 0
1/(a^1) = 3/4 // * a^1
1 = 3/4*a^1 // : 3/4
4/3 = a^1
a = 4/3
a = 4/3
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