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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
5/a = 9/17 // - 9/17
5/a-(9/17) = 0
5/a-9/17 = 0
5*a^-1 = 9/17 // : 5
a^-1 = 9/85
-1 < 0
1/(a^1) = 9/85 // * a^1
1 = 9/85*a^1 // : 9/85
85/9 = a^1
a = 85/9
a = 85/9
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