Приведите подобные слагаемые
1) 7x - 18x + 25x - 6x
2) -0,3b - 1,4b + 3,1b + 0,7b
3) 11a - 16b - 18a + 9a
4) -0,8k + 0,9p - 1,7k + 0,5k + 1,4p
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