20 / 12 = 5/3
9 * 5/3 = (9*5) /3 = 45/3 = 15
donc 12/9 = 20/15
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20 / 12 = 5/3
9 * 5/3 = (9*5) /3 = 45/3 = 15
donc 12/9 = 20/15