Решите пожалуйста ... Заранее спасибо
1) 2а - 8а + 3а =
2) 7а - 13а - 4а =
3) 9в - 5в - 3в =
4) 8в + 4в - 7в =
5) 0.6с - с + 0.5с =
6) 2.9с + 3с - 10с =
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