-10 2/7:1 13/35+3 9/11:1 1/55=
-10 2/7:1 13/35=-72/7:48/35=-9/2=-4 1/2 3 9/11:1 1/55=42/11:56/55=15/4=3 3/4 -4 1/2+3 3/4=-9/2+15/4=-3/4