428. Упростите выражение:
Решение:
1. 6a + 8a = 14a 2. 28c – 15c = 13c 3. 13y – 2y = 11y 4. m + 29m = 30m 5. 98p – p = 97p 6. 17k + k = 18k 7. 4x + 13x + 15x = 32x 8. 67z – 18z + 37 = 49z + 37 9. 35x + x – 6 = 36x – 6