8/15*x=4 1/5
8/15*x=21/5
x=21/5:8/15
х=21/5*15/8
x=63/8
x=7 7/8
х=7.825
Ответ: 7.825
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8/15*x=4 1/5
8/15*x=21/5
x=21/5:8/15
х=21/5*15/8
x=63/8
x=7 7/8
х=7.825
Ответ: 7.825