You need to get x by itself on one side, so add 4 to both sides, then divide both sides by six.

You need to get y by itself, so add 9 to both sides then divide both sides by 2.

You need to get a by itself, so add ten to both sides, then multiply both sides by 4.

You need x by itself, so either

a) add x to both sides then subtract 17 from both sides

or

b) subtract 5 from both sides, multiply both sides by negative one.

Maybe start on your work sooner next time.