4 7 x 56 July 8, 2019 16 32 64 128 4 7 x 560 4 7 3 x 3 53 56 4 over 7 x 56 2 4 x 7 56 4 7 x 56 solve for x 1 4 x 22 7 x 56 4 x 7 2 4x 2 56x 196 (- 22 4 x 56 (- 7 56 7 x 4 1 2 4 x 7 56 bằng bao nhiêu
