Помогите) Приведите подобные слагаемые:
1)1,3а-2+4,6а=?
2)5,7а-8-а=?
3)10,2в-5,3в-6=?
4)7-3,8в-9в=?
5)-3-4,9с+10=?
6)15с+3-2,9=?
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