Упростим выражения:
5x + 7x = 12x
17a - 9a = 8a
34a - a = 33a
c + 72c = 73c
7x + 8x + 12x = 27x
53y + 18y - 24y = 71y - 24y = 47y
14m + 15m + 16 = 29m + 16
69n - n - 18 = 68n - 18
25x + 37x - 17x - x = 62x - 17x - x = 45x - x = 44x