3 : х = 7 : 2,1,
х * 7 = 3 * 2,1,
7х = 6,3,
х = 0,9,
3 : 0,9 = 7 : 2,1,
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3 : х = 7 : 2,1,
х * 7 = 3 * 2,1,
7х = 6,3,
х = 0,9,
3 : 0,9 = 7 : 2,1,