Ответ:
7(5+х)-4х=4х-57
35+7х-4х=4х-57
35+3х=4х-57
35=х-57
х=35+57
х=92
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Ответ:
7(5+х)-4х=4х-57
35+7х-4х=4х-57
35+3х=4х-57
35=х-57
х=35+57
х=92