Приведите подобные слагаемые (760-761)
1) 9 1/9a - 20c + 1/3a + 18,1c
2) 6,5x - 7,1x - 19 + 8 1/4x
3) -1,6y + 2 3/7y - 3y + 2,6
4) -4 1/6z + 2 1/3c - 3c + 5,5z
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