7-int(x)=x.
While I agree with Charie's answer, Wolfram Alpha gives "4" as the answer to "x+floor(x)=7". Not sure why. Could it involve some sort of definition of 4=3.999(repeating)? This is not an area on which I can comment much.
blackjack
<a href="http://c.casalemedia.com/c?s=51816&f=3&id=0" target="_blank"><img src="http://as.casalemedia.com/s?s=51816&u=http://perplexus.info&f=3&id=0&if=0" width="120" height="600" border="0"></a>
flooble's webmaster puzzle
re: solution
