(8 2/3-2.5y):9 8/11=55/214
(8 2/3 - 2,5у) : 9 8/11 = 55/214 8 2/3 - 2,5у = 55/214 * 9 8/11 8 2/3 - 2,5у = 55/214 * 107/11 8 2/3 - 2,5у = 5/2 = 2 1/2 2,5у = 8 2/3 - 2 1/2 2,5у = 8 4/6 - 2 3/6 2,5у = 6 1/6 у = 6 1/6 : 25/10 у = 37/6 * 10/25 у = 185/75 у = 2 35/75 у = 2 7/15