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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
5/a = 4/3 // - 4/3
5/a-(4/3) = 0
5/a-4/3 = 0
5*a^-1 = 4/3 // : 5
a^-1 = 4/15
-1 < 0
1/(a^1) = 4/15 // * a^1
1 = 4/15*a^1 // : 4/15
15/4 = a^1
a = 15/4
a = 15/4
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