solve 3/4z-1/3=2/3z+1/5
3/4z - 1/3 = 2/3z + 1/53/4z - 2/3z = 1/5 + 1/39/12z - 8/12z = 3/15 + 5/151/12z = 8/15z = 8/15 * 12z = 96/15 = 32/5 or 6 2/5