а) 12a - 10a - 10a + 6b = (12a - 10a - 10a) + 6b = -8a + 6b
б) 4(3x - 2) + 7 = 12x - 8 + 7 = 12x - 1
в) 8x - (2x + 5) + (x - 1) = 8x - 2x - 5 + x - 1 = 7x - 6
а) 12a - 10a - 10a + 6b = (12a - 10a - 10a) + 6b = -8a + 6b
б) 4(3x - 2) + 7 = 12x - 8 + 7 = 12x - 1
в) 8x - (2x + 5) + (x - 1) = 8x - 2x - 5 + x - 1 = 7x - 6