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#Ruby (43 bytes) def rand7;(0..7).reduce{|i|i+rand5}%7+1;end
def rand7;(0..7).reduce{|i|i+rand5}%7+1;end
cemper93's solution ported to Ruby is three bytes shorter ;) (34 bytes)
def rand7;eval("+rand5"*7)%7+1;end