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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
2/a-(7/9) = 0
2/a-7/9 = 0
2*a^-1 = 7/9 // : 2
a^-1 = 7/18
-1 < 0
1/(a^1) = 7/18 // * a^1
1 = 7/18*a^1 // : 7/18
18/7 = a^1
a = 18/7
a = 18/7
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