Ответ:
1,3х + 5,7х = 15,82
7х = 15,82
х = 15,82 ÷ 7
х = 2,26
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Ответ:
1,3х + 5,7х = 15,82
7х = 15,82
х = 15,82 ÷ 7
х = 2,26