Solve: x/4 = 3/12, x = 1, Solve: 5/10 = x/20, x = 10, Solve: x/6 = 2/3, x = 4, Solve: 4/5 = x/15, x = 12, Solve: x/8 = 5/20, x = 2, Solve: 7/14 = x/28, x = 14, Solve: x/9 = 4/12, x = 3, Solve: 3/7 = x/21, x = 9

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