Выполните приведение подобных слагаемых: 1) а + 6,2а - 6,5а – а; 2) 0,9n - 1,3n + 0,7n + n; 3) 10a + b – 10b – а; 4) -8y + 7x + 6y + 7x; 5) -8x + 5,2a +3x+ 5a; 6) 5a + 7a - 9,2m + 15m; 7) -6a + 5a – x + 4; 8) 23x – 23 + 40 + 4x; 9) -12p + 3k + 3,2p – 2,3k.
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