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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
27/a = 80.73 // - 80.73
27/a-80.73 = 0
27*a^-1 = 80.73 // : 27
a^-1 = 2.99
-1 < 0
1/(a^1) = 2.99 // * a^1
1 = 2.99*a^1 // : 2.99
0.33444816 = a^1
a = 0.33444816
a = 0.33444816
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