1) 4a - b - 7a + 9b = -3a + 8b2) 12 - 6(3c - 2) = 12 - 18c + 12 = -18c + 243) 12x + (5x - 7) - (3x + 9) = 12x + 5x - 7 - 3x - 9 = 14x - 164) -2(6.7a + 0.5) + 5.3 - 2 = -13.4a - 1.0 + 5.3 - 2 = -13.4a + 2.3
1) 4a - b - 7a + 9b = -3a + 8b
2) 12 - 6(3c - 2) = 12 - 18c + 12 = -18c + 24
3) 12x + (5x - 7) - (3x + 9) = 12x + 5x - 7 - 3x - 9 = 14x - 16
4) -2(6.7a + 0.5) + 5.3 - 2 = -13.4a - 1.0 + 5.3 - 2 = -13.4a + 2.3