Ответ:
52+13x-4x=2815
13х-4х=2815-52
9х=2763
х=2763÷9
х=307
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Ответ:
52+13x-4x=2815
13х-4х=2815-52
9х=2763
х=2763÷9
х=307
52+9х=2815
9х=2815-52
9х=2763
х=2763 : 9
х=307
Ответ: 307