Ответ:
х+7х/3=90
3х/3 + 7х/3=90
10х/3=90
10х=90*3
10х=270
х=27
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Ответ:
х+7х/3=90
3х/3 + 7х/3=90
10х/3=90
10х=90*3
10х=270
х=27