1) 28a + 42 - 12a = 16a + 422) 8x - 64 + 8x = 16x - 643) 1.7a - 6.8 + 0.66 - 0.62a = 1.7a + 3.6 - 0.62a - 6.8 = 1.1a - 3.24) 12x - 9y - 12y + 7.2 = 12x - 21y + 7.25) -4.3x + 2.4 - 5.8 + 2.6x = -1.7x - 3.46) 8/1515/4m - 8/155/16n - 3/2020/3m + 3/20*4/9n = 2m - 1n - 3m + 4/3n = -1m + 1/3n
1) 28a + 42 - 12a = 16a + 42
2) 8x - 64 + 8x = 16x - 64
3) 1.7a - 6.8 + 0.66 - 0.62a = 1.7a + 3.6 - 0.62a - 6.8 = 1.1a - 3.2
4) 12x - 9y - 12y + 7.2 = 12x - 21y + 7.2
5) -4.3x + 2.4 - 5.8 + 2.6x = -1.7x - 3.4
6) 8/1515/4m - 8/155/16n - 3/2020/3m + 3/20*4/9n = 2m - 1n - 3m + 4/3n = -1m + 1/3n