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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
54.4/a = 73.4/46 // - 73.4/46
54.4/a-(73.4/46) = 0
54.4/a-1.59565217 = 0
54.4*a^-1 = 1.59565217 // : 54.4
a^-1 = 0.02933184
-1 < 0
1/(a^1) = 0.02933184 // * a^1
1 = 0.02933184*a^1 // : 0.02933184
34.09264472 = a^1
a = 34.09264472
a = 34.09264472
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