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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
27/a = 5 // - 5
27/a-5 = 0
27*a^-1 = 5 // : 27
a^-1 = 5/27
-1 < 0
1/(a^1) = 5/27 // * a^1
1 = 5/27*a^1 // : 5/27
27/5 = a^1
a = 27/5
a = 27/5
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