a) (6t - 2) + (3 - 2t) = 6t - 2 + 3 - 2t = 4t + 1
b) (-12c + 0,5d - 2,5) - (-4d + 3,5c + 1,5) = -12c + 0,5d - 2,5 + 4d - 3,5c -1,5 = -15,5c + 4,5 d - 4
c) (2a - 3b + 1) - (4a - 5b + 3) + (5a - 7b) = 2a - 3b + 1 - 4a + 5b - 3 + 5a - 7b =
3a - 5b - 2
d) (9z - 1) - (3z + 1/3) - (-5z - 11 1/3) = 9z - 1 - 3z - 1/3 + 5z + 11 1/3 = 11 z + 10
e) (1 1/4m + 6k) - (-3k + 2m) + (-4k + 2 1/4m) = 1 1/4 m + 6k + 3k - 2m - 4k + 2 1/4m = 1 1/2 m + 5k
