7,3x + 4x = 11,3x
3a - 5a = -2a
n - 4/5n = 5/5n - 4/5n = 1/5n
-7/5m + m = -7/5m + 5/5m = -2/5m
2,1x + 4,5x - 1,9x = 6,6x - 1,9x = 4,7x
7/11a + 8/11a - 4/11a = 15/11a - 4/11a = 11/11a = a
-6a - a + 7 = -7a + 7
9n - 5y - 4n + 7y = 5n + 2y
3,6x + 5,1y - 2,9x - 4,2y = (3,6x - 2,9x) + (5,1y - 4,2y) = 0,7x + 0,9y