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