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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
9.6/a = 0.8/0.6 // - 0.8/0.6
9.6/a-(0.8/0.6) = 0
9.6/a-1.33333333 = 0
9.6*a^-1 = 1.33333333 // : 9.6
a^-1 = 0.13888889
-1 < 0
1/(a^1) = 0.13888889 // * a^1
1 = 0.13888889*a^1 // : 0.13888889
7.19999994 = a^1
a = 7.19999994
a = 7.19999994
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