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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
34.4/a = 4.3 // - 4.3
34.4/a-4.3 = 0
34.4*a^-1 = 4.3 // : 34.4
a^-1 = 0.125
-1 < 0
1/(a^1) = 0.125 // * a^1
1 = 0.125*a^1 // : 0.125
8 = a^1
a = 8
a = 8
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