Ответ:
6с- 30d= 6(c - 5d)
ck - k= k(c - 1)
7 - 21c = 7(1-3c)
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Ответ:
6с- 30d= 6(c - 5d)
ck - k= k(c - 1)
7 - 21c = 7(1-3c)