9 2 х 15 July 8, 2019 16 32 64 128 9 2 x 15 9 2 x 15 4 9 1 2 x 15 9 2 x 3 15 9 10 x 2 15 2 х - 9+2х=15 2 х 9 2х 15 2х 9 15 х
