8,19 + a + (–5,8) + (–3,19) + 5,8 = a + (8,19 – 3,19) + (5,8 – 5,8) = a + 5
При a = –2 3/7: a + 5 = –2 3/7 + 5 = 3 – 3/7 = 2 4/7
8,19 + a + (–5,8) + (–3,19) + 5,8 = a + (8,19 – 3,19) + (5,8 – 5,8) = a + 5
При a = –2 3/7: a + 5 = –2 3/7 + 5 = 3 – 3/7 = 2 4/7