X 3 7 21 July 8, 2019 16 32 64 128 3 x 7 )=- 21 3x X 7 3 216 X 3 7 4 21 2 x 3 )+ 7 21 X 3 7 6 21 Х 3 )( х 7 )= 21 X 3 13 21 7 7 x 3 )=- 21 7x 3 7 x 21 1 3 7 x 21 9 7 x 3 21 meme 21 x 3 )+ 20 7 3x 2 3 7 1 21 x 14 1 6 X (- 3 7 )= 5 21 Х 3 7 6 21
