приведите к подобному знаменателю
1)

2) 7a-13a-4a
4) 8b + 4b - 7b
6) 2,9c+3c-10

2)

2) 5a - (0.7a + 8)
4) 9.6b + (7 - 0,4b)
6) -5c + (13 - 6c)

P.S: потом ещё 2 задачи
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