х/5 - х/15 = 4
3х-х = 60
2х = 60
х = 60 : 2
х = 30
ответ: х = 30
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х/5 - х/15 = 4
3х-х = 60
2х = 60
х = 60 : 2
х = 30
ответ: х = 30