X-(7 5/9-5 1/6)=-3,5
Х- 2 7/18=-3,5 7 5/9/-5 1/6=2 5/9-1/6=2 10/18-3/18=2 7/18 х=-3,5+2 7/18 х=-3 1/2+2 7/18 х=-1 1/2+7/18= -1 9/18+7/18=-1 2/18=-1 1/9