3/4у - 0,5.; 2/3 + 5/3х.; 28; 57-4х; 22у-55.

(3/8y - 1/4) * 2 = 6/8 y - 2/4 = 3/4 y - 1/2 

4(1/6+5/12x) = 4/6 + 20/12x = 2/3 +5/3 x = 2/3 + 1 целая 2/3x

(1 целая 1\2у+5\6)*12 = (3/2y + 5/6)*12 = 36/2y + 60/6 = 18y + 10

 (3 целых 1\6-2\9х)*18 = (19/6 - 2/9x) * 18 = 342/6 - 36/9x = 57 - 4 x

10(2 целых 1\5у _5 целых 1\2) = 10* (11/5y - 11/2) = 110/5y - 110/2 = 22y - 55