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#### elijahjt

times when I try to type a letter in an equation (e.g. y=2x), the letters (so

the y and the x) just show up as boxes. The only way it seems I can get it

working is to copy and paste from a previous equation that worked with

letters, clear out the irrelevant equation and type in the new one. However,

I feel there MUST be a better way of doing this. Any help would be

appreciated.