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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
5/a-2 = -13 // + 13
5/a-2+13 = 0
5*a^-1 = -11 // : 5
a^-1 = -11/5
-1 < 0
1/(a^1) = -11/5 // * a^1
1 = -11/5*a^1 // : -11/5
-5/11 = a^1
a = -5/11
a = -5/11
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