(this is Devon, by the way)

hmm. it seems to vary depending on the kind of calculator you use. if you try it on the type that solves after every two numbers you type, it usually doesnt work.. but if you use a calculator which waits until you're finished with the whole equation to solve it, it does.. I'm pretty sure it works when you solve it algebraically, so.. I guess I'll wait for a couple more responses and see how it worked out for others and then see what I did wrong-- thanks for trying it out

(on the two calculators I tried it on, 5 yields 11 and 2 yields 8)