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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
58/a = 2.9 // - 2.9
58/a-2.9 = 0
58*a^-1 = 2.9 // : 58
a^-1 = 0.05
-1 < 0
1/(a^1) = 0.05 // * a^1
1 = 0.05*a^1 // : 0.05
20 = a^1
a = 20
a = 20
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