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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
9/5 = 6/a // - 6/a
9/5-(6/a) = 0
9/5-6*a^-1 = 0
-6*a^-1 = -9/5 // : -6
a^-1 = 3/10
-1 < 0
1/(a^1) = 3/10 // * a^1
1 = 3/10*a^1 // : 3/10
10/3 = a^1
a = 10/3
a = 10/3
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