6/7s - 3/4 = 4/5 - 1/7s + 1/6

6/7s - 3/4 = 4/5 - 1/7s + 1/6

6/7s + 1/7s = 3/4 + 4/5 + 1/6
s = 45/60 + 48/60 + 10/60
s = 103/60 = 1 43/60