Odpowiedź :
K = 7a + 3b
R = 5a - 3b
K + R = 7a + 3b + 5a - 3b = 12a
K - R = 7a + 3b - ( 5a - 3b ) = 7a + 3b - 5a + 3b = 2a + 6b
K = 7a + 3b
R = 5a - 3b
K + R = 7a + 3b + 5a - 3b = 12a
K - R = 7a + 3b - ( 5a - 3b ) = 7a + 3b - 5a + 3b = 2a + 6b