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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
34 = 45/a // - 45/a
34-(45/a) = 0
34-45*a^-1 = 0
-45*a^-1 = -34 // : -45
a^-1 = 34/45
-1 < 0
1/(a^1) = 34/45 // * a^1
1 = 34/45*a^1 // : 34/45
45/34 = a^1
a = 45/34
a = 45/34
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