= (9 1/9а + 1/3а) - (20с - 18,1с) =
= (9 1/9а + 3/9а) - 1,9с =
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= (9 1/9а + 1/3а) - (20с - 18,1с) =
= (9 1/9а + 3/9а) - 1,9с =
= 9 4/9а - 1,9с.