Odpowiedź:
1(2a + 3b - 4c + 5d) - (a - 7b + 2c - 6d) = 2a + 3b - 4c + 5d - a + 7b - 2c + 6d = a + 10b - 6c + 11d
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Odpowiedź:
1(2a + 3b - 4c + 5d) - (a - 7b + 2c - 6d) = 2a + 3b - 4c + 5d - a + 7b - 2c + 6d = a + 10b - 6c + 11d