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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
9/a-(5/4) = 0
9/a-5/4 = 0
9*a^-1 = 5/4 // : 9
a^-1 = 5/36
-1 < 0
1/(a^1) = 5/36 // * a^1
1 = 5/36*a^1 // : 5/36
36/5 = a^1
a = 36/5
a = 36/5
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