Well first, you want to subtract 4/11 from both sides of the equation. To do this, you must find the common denominator between 4/11 and 9/22. The common denominator is 22. This is how it should look:
 4/11 + s = 9/22
 8/22 + s = 9/22
 -8/22 -8/22
 s = 1/22