х · 6/7 = 2/7
х = 2/7 : 6/7
х = 2/7 · 7/6
х = 2/6
х = 1/3 - сократили на 2
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х · 6/7 = 2/7
х = 2/7 : 6/7
х = 2/7 · 7/6
х = 2/6
х = 1/3 - сократили на 2