5 4 х=19 3 July 8, 2019 16 32 64 128 5 4 х 19 3 5 4 19 х 3 4 7 11 4 х 5 9 19 36 4 5 x 3 = 19 5 20 x 4 19 x 3 18 5 4+х=19 3 5 y +4=19 5 + 4 = 19
