(5,342 + 8,951) + (4,568 + a + 1,049) = 5,342 + 8,951 + (4,568 + a + 1,049) = 5,342 + 8,951 + 4,568 + a + 1,049 = 19,91 + a
(5,342 + 8,951) + (4,568 + a + 1,049) = 5,342 + 8,951 + (4,568 + a + 1,049) = 5,342 + 8,951 + 4,568 + a + 1,049 = 19,91 + a