1289. Зведи подібні доданки: 1) 3m + 2m; 4) 9y + y - 7у; 7) -4a + a; 2) 9a - a; 5) -2b-7b; 8) 7m - 6m - m. 3) 5b + b; 6) 2y + 2y;​
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