80=3:7
80=3х:7х
80=10х
х=80:10
х=8
3х=3·8=24
7х=7·8=56
Ответ:24
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80=3:7
80=3х:7х
80=10х
х=80:10
х=8
3х=3·8=24
7х=7·8=56
Ответ:24