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Найдите решение системы с помощью способа подстановки:
а) 5х+20=-6у
9у-25=-2х

б)14-3в=4а
25+3в=5а

в)2к-3=2-9р
3к-13=5р+13

г)50-4m=5-5n
21-6n=26+5m
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