3 1/6-(х+1 1/12)=1/4

3 1/6-(х+1 1/12)=1/4
3 2/12 - x - 1 1/12 = 3/12
2 1/12 - x = 3/12
x = 2 1/12 - 3/12
x = 1 10/12
x = 1 5/6