...=
9/7Х-1/3=2/21
9/7Х=2/21+1/3=2/21+7/21=9/21
Х=9/21:9/7=9/21 х 7/9
Х=3
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...=
9/7Х-1/3=2/21
9/7Х=2/21+1/3=2/21+7/21=9/21
Х=9/21:9/7=9/21 х 7/9
Х=3