2n 7 3 5n 6 4 July 8, 2019 16 32 64 128 6) 4(5 - n) - 3(2n + 7) = 0 2 6n-1 3n+5 7n-2 9 2 + 3 + 4 + 5 + 6 6n+5 и 7n+5
