2 5/6:(x+ 7 7/30)·1 6/7=5/7
2 5/6:(x+ 7 7/30) = 5/7 : 1 6/7
2 5/6:(x+ 7 7/30) = 5/7 : 13/7
2 5/6:(x+ 7 7/30) = 5/13
(x+ 7 7/30) = 2 5/6 : 5/13
x+ 7 7/30 =17/6 : 5/13
x+ 7 7/30 =221/30
x+ 7 7/30 = 7 11/30
х = 7 11/30 - 7 7/30
х = 4/30
х = 2/15
