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=[ a^5 * a^ 18] : a^-5 * a^-1 =
=a^ (5+18) : a^-5 * a^-1 =
= a^23 : a^-5 * a^-1 =
= a^(23 - (-5) + (-1))=
=a^ (23+5-1)=
=a^27
Nie wiem, czy dobrze :/