Предмет: Математика, автор: лисичка626

помогитееееееее!!!!!!!!

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Автор ответа: tinaarm888
0
(3/14+5х/21)=91/12
5х/21=91/12-3/14
5х/21=1310/168=655/84
х=655*21/84*5=131/4
х=131/4 
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