Calculation: 49 / 50 × 51-3 / 11 × 77 × 7 / 3 solution: X-1 / 2 = 2 / 3-3 / 4

49/50×51-3/11×77×7/3
=(1-1/50)×51-49
=51-51/50-49
=49/50
The solution equation: X-1 / 2 = 2 / 3-3 / 4
x=1/2+2/3-3/4
x=2/3-1/4
x=5/12