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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
10/a = 6/5 // - 6/5
10/a-(6/5) = 0
10/a-6/5 = 0
10*a^-1 = 6/5 // : 10
a^-1 = 3/25
-1 < 0
1/(a^1) = 3/25 // * a^1
1 = 3/25*a^1 // : 3/25
25/3 = a^1
a = 25/3
a = 25/3
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