Reduceți termenii asemenea:
a) 9z + 11z - 8 + z =
b) 2.5x + 0.5x - 1.5x + 3.5x - 1.2x =
c) 3.75b - 1.25b + (b - 0.3b) - (0.7b + 0.3b) =
d) 2.7a - (3.8a - 0.3a + 0.5a) + 1.3a =