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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
0.9/a = 1 // - 1
0.9/a-1 = 0
0.9*a^-1 = 1 // : 0.9
a^-1 = 1.11111111
-1 < 0
1/(a^1) = 1.11111111 // * a^1
1 = 1.11111111*a^1 // : 1.11111111
0.9 = a^1
a = 0.9
a = 0.9
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