3 9/10-(2 - 1 11/35):9/49+1/2

-10 2/7:1 13/35+3 9/11:1 1/55=-72/2:48/35+42/11:56/55=-360/35:48/35+210/55:56/55=-360/48+210/55=-7 1/2+3 45/55=-7 55/110+3 90/110=-3 75/110=-3 15/25