2целых 1/6-(х+1цел1/12)=0,25

x+1 1/12=2 1/6-1/4
x+1 1/12=2 2/12-3/12
x=1 1/12=1 14/12-3/12
x+1 1/12=1 11/12
x=1 11/12-1 1/12
x=10/12
x=5/6

26/12-10/12-13/12=3/12 26-10-13=3