-5/18 (9c + 4) + 4c - 0.5 (3c - 7/9)= -5/18 9c - 5/18 4 + 4c - 0.5 3c + 0.5 7/9= -5/2c - 5/9 + 4c - 1.5c + 3.5/9= -5/2c + 4c - 1.5c + 0.3889= -0.5c + 0.3889
-5/18 (9c + 4) + 4c - 0.5 (3c - 7/9)
= -5/18 9c - 5/18 4 + 4c - 0.5 3c + 0.5 7/9
= -5/2c - 5/9 + 4c - 1.5c + 3.5/9
= -5/2c + 4c - 1.5c + 0.3889
= -0.5c + 0.3889