x/11=(((3+3)x(2x5))^2)+289

ok, not exactly the best equation usage in the title, but you might have got that 'x' was the telephonic numeric answer to spell HAPPY.  Then again it was pretty obscure, most would have given up after just looking at it.
picture by simon

Very quick one just to let you know that there is now even more research on the brain being stimulated by practising puzzles like suduko and crosswords (or maths equations).  Even greater news is that it could also stave of dementia or some other health problems associated with the brain.

can read it here

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