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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
6/22 = 15/a // - 15/a
6/22-(15/a) = 0
6/22-15*a^-1 = 0
-15*a^-1 = -3/11 // : -15
a^-1 = 1/55
-1 < 0
1/(a^1) = 1/55 // * a^1
1 = 1/55*a^1 // : 1/55
55 = a^1
a = 55
a = 55
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