1289-(872-х)=638
1289-(-х+872)=638
1289+х-872=638
417+х=638
х+417=638
х=638-417
=221
1289-(872-221)=638
638=638
Ответ :х=221
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1289-(872-х)=638
1289-(-х+872)=638
1289+х-872=638
417+х=638
х+417=638
х=638-417
=221
1289-(872-221)=638
638=638
Ответ :х=221