I'm must be missing something because this sounds too easy:

Code:

ans = (((rand5()-1) / 4f)*6f) + 1;


You could reduce this down, but I left it long so you can follow the logic.

Code:

(rand5()-1) -> random number 0-4
 / 4        -> random number 0-1
 * 6        -> random number 0-6
 + 1        -> random number 1-7


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