Упростите выражения:

23а - 7в - 4а + 10в

6,5а + 5,3в - 9в -6,5а

3,5в - 4,9с - 3,5в + 7с

ав - 2ав - 3в + ав + 5в

8ху + 9ху - 9ху - 7х

17,8х + 9у - 5,5х - 10у
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