n = 28a + 12 n-12 = 28a 28 | (n-12)
n = 32b + 12 n - 12 = 32b 32 | (n-12)
n = 36c + 12 n - 12 = 36c 36 |(n -12)
[28, 32, 36] =4· 504 n - 12 = 2016 n = 2028
b) n = 36a + 9 (n-9) = 36a 36 | (n-9)
n = 28b + 9 n - 9 = 28b 28 | (n-9)
n = 45c + 9 n - 9 = 45c 45 | (n-9)
{36, 28, 45 ] = 1260 n - 9 = 1260 n = 1269