1971+х:7=2139;
1971+1/7*х=2139; |*7
13797+х=14973;
х=14973-13797;
х=1176.
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1971+х:7=2139;
1971+1/7*х=2139; |*7
13797+х=14973;
х=14973-13797;
х=1176.