Приведите подобные слагаемые:
a) 20x - 16x + 14y - 13x;
б)25c - 12p - 13c - 2p;
в)17x - 6x - 20 - x;
г)24a + 11 - 25 a - 6;
д)12 + 3x - 13;

Даю 20 баллов:3
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