а) 8x - 6y + 7x - 2y = (8x + 7x) + (-6y - 2y) = 15x - 8y
б) 27p + 14q - 16p - 3q = (27p - 16p) + (14q - 3q) = 11p + 11q
в) 3,5b - 2,4c - 0,6c - 0,7b = (3,5b - 0,7b) + (-2,4c - 0,6c) = 2,8b - 3c
г) 1,6a + 4x - 2,8a - 7,5x = (1,6a - 2,8a) + (4x - 7,5x) = -1,2a - 3,5x