х:7=275+425
х:7=700
х=700*7
х=4900
проверка:
4900:7=275+425
700=700
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х:7=275+425
х:7=700
х=700*7
х=4900
проверка:
4900:7=275+425
700=700
x=700*7
x=4900
Ответ:4900