28a + 42 - 12a = 16a + 42
8x - 64 + 8x = 16x - 64
1.7a - 6.8 + 0.6 6 - 0.6 2a = 1.7a - 6.8 + 3.6 - 1.2a = 0.5a - 3.2
28a + 42 - 12a = 16a + 42
8x - 64 + 8x = 16x - 64
1.7a - 6.8 + 0.6 6 - 0.6 2a = 1.7a - 6.8 + 3.6 - 1.2a = 0.5a - 3.2