2) (7a - 13a) - 4a = -6a - 4a = -10a4) (8b + 4b) - 7b = 12b - 7b = 5b6) (2.9c + 3c) - 10c = 5.9c - 10c = -4.1c
2) (7a - 13a) - 4a = -6a - 4a = -10a
4) (8b + 4b) - 7b = 12b - 7b = 5b
6) (2.9c + 3c) - 10c = 5.9c - 10c = -4.1c