а) -3a + 7a - 10a = -6a
б) (3x - 5) - (-2x + 7) = 3x - 5 + 2x - 7 = 5x - 12
в) -2(2,5m - 1) + 3(m - 4) = -5m + 2 + 3m - 12 = -2m - 10
г) 7a - 5b - 5a + 8b = 2a + 3b
д) 4(3x - y) - 5(x + y) = 12x - 4y - 5x - 5y = 7x - 9y
а) -3a + 7a - 10a = -6a
б) (3x - 5) - (-2x + 7) = 3x - 5 + 2x - 7 = 5x - 12
в) -2(2,5m - 1) + 3(m - 4) = -5m + 2 + 3m - 12 = -2m - 10
г) 7a - 5b - 5a + 8b = 2a + 3b
д) 4(3x - y) - 5(x + y) = 12x - 4y - 5x - 5y = 7x - 9y