2/7 х+3/7х=2 7/14
2/7х+3/7х= 2+3/7=5/7х
5/7х=2 7/14
5/7х=35/14
5/7х=5/2
х=7/2→3,5
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2/7 х+3/7х=2 7/14
2/7х+3/7х= 2+3/7=5/7х
5/7х=2 7/14
5/7х=35/14
5/7х=5/2
х=7/2→3,5