Ответ:
Пошаговое объяснение:
1) 3a - (-b -2c) = 3а + b + 2c
2) 8x + (-5y + z) = 8x - 5y + z
3) (7m - n) - (2 + 3x) = 7m - n - 2 - 3x
4) -7/9 - (4/5c + 2/9) = -7/9 - 4/5c - 2/9 = -1 - 4/5c
5) -2 * (x + 3) + 5 * (3y - 2) = -2x - 6 + 15y - 10 = -2x - 16 + 15y
6) -4 * (4k - 7) - 3 * (-3m - 2) = -16k + 28 + 9m + 6 = -16k + 34 + 9m
7) 1/5 * (10x + 15) - 2/9 * (9x + 18) = 2x + 3 - 2x - 4 = -1