1.17/12-x=5/6
17/12-x+x=5/6+x
17/12-5/6=5/6+x-5/6
x=7/12
2.x-5/18-1/6=5/9
x-5/18-1/6+5/18+1/6=5/9+5/18+1/6
x=1