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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
10.85/a = 3.5 // - 3.5
10.85/a-3.5 = 0
10.85*a^-1 = 3.5 // : 10.85
a^-1 = 0.32258065
-1 < 0
1/(a^1) = 0.32258065 // * a^1
1 = 0.32258065*a^1 // : 0.32258065
3.09999995 = a^1
a = 3.09999995
a = 3.09999995
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