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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
10/a = 0.6691 // - 0.6691
10/a-0.6691 = 0
10*a^-1 = 0.6691 // : 10
a^-1 = 0.06691
-1 < 0
1/(a^1) = 0.06691 // * a^1
1 = 0.06691*a^1 // : 0.06691
14.94544911 = a^1
a = 14.94544911
a = 14.94544911
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