This problem is impossible to solve to a number without defining y. cbrsarah, I use algebra every day. If y=x+5, for example, then 5x+15=15, so 5x=0, which means x=0. That is just one number, so give y! My rant is over now.
@ Digital Frog – However, destructive distillation can compromise the structural integrity of the lump as well as the fact that carbonaceous materials are able to create imperfect ionic bonds with the sulfur and thus form an exothermal reaction and ignite the thing. Gasp
Then the eyes, then the fingernails, then the teeth, then the tongue, then…