660/168 =
(22 × 3 × 5 × 11)/(23 × 3 × 7) =
((22 × 3 × 5 × 11) ÷ (22 × 3)) / ((23 × 3 × 7) ÷ (22 × 3)) =
(5 × 11)/(2 × 7) =
55/14
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