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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
1/a-8-5 = 4/a-8 // - 4/a-8
1/a-(4/a)-8-5+8 = 0
1/a-4*a^-1-8-5+8 = 0
-3*a^-1 = 5 // : -3
a^-1 = -5/3
-1 < 0
1/(a^1) = -5/3 // * a^1
1 = -5/3*a^1 // : -5/3
-3/5 = a^1
a = -3/5
a = -3/5
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