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