Steven has w peaches. Jake has x fewer peaches than Steven who has y more peaches than Jill. How many peaches does Jill have?
Let's denote the number of peaches Jill has by j.

j = w - y

Jake has x fewer peaches than Steven who has y more peaches than Jill.

Therefore, Jake has w - y - x peaches.

Plugging in for w we get that Jake has w - y - x peaches.

Therefore, the answer (symbolic expression) is: 

j = w - y - x