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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
13/6 = 1/a // - 1/a
13/6-(1/a) = 0
13/6-a^-1 = 0
-1*a^-1 = -13/6 // : -1
a^-1 = 13/6
-1 < 0
1/(a^1) = 13/6 // * a^1
1 = 13/6*a^1 // : 13/6
6/13 = a^1
a = 6/13
a = 6/13
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