Ответ:
900000-31×х=887600
31-х=900000-887600
31-х=12400
х=12400÷31
х=400
900000-31×400=887600
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Ответ:
900000-31×х=887600
31-х=900000-887600
31-х=12400
х=12400÷31
х=400
900000-31×400=887600