5/12 у + 1,3 = 0,53 + 7/8 у | * 24
24 * 5/12 y + 1.3 * 24 = 0.53 * 24 + 24 * 7/8 y
2 * 5y + 31.2 = 12.72 + 3 * 7y
10y + 31.2 = 12.72 + 21y
31. 2 - 12.72 = (21-10)y
18.48 = 11y
y = 18.48 : 11
y = 1.68
5/12 у-7/8 у=0,53-1,3
10/24у-21/24 у=-0,77
-11 у=-0,77*24
-11 у=-18,48
у =1,68
