3/4 * 7/8 - 3/4 * (7/8 - 2/3) = 3/4 * (7/8 - (7/8 - 2/3)) = 3/4 * (7/8 - 7/8 + 2/3) = 3/4 * 2/3 = 1/2
3/4 * 7/8 - 3/4 * (7/8 - 2/3) = 3/4 * (7/8 - (7/8 - 2/3)) = 3/4 * (7/8 - 7/8 + 2/3) = 3/4 * 2/3 = 1/2