2/3-x+1/7=9/14等几？

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2/3-x=9/14-1/7 2/3-x=1/2 x=2/3-1/2 x=1/6

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2/3-x=9/14-1/扰迅蔽7 2/3-x=9/14-2/昌链14 2/3-x=7/14 2/3-x=1/2 x=2/3-1/2 x=4/缓州6-3/6 x=1/6

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