Ответ:
3(х+7)-15=27
3х+21-15=27
3х=27+15-21
3х=21
х=7
3(7+7)-15=27
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Ответ:
3(х+7)-15=27
3х+21-15=27
3х=27+15-21
3х=21
х=7
3(7+7)-15=27