13 5 x 9 7 July 8, 2019 16 32 64 128 13 2 5 7 x 3 9 5 5x 9 13 x 7 1 5 9 13 x 780 solve the equation 5 7 4 13 x 9 7 6 9 13 x 5 4 13 x 9 x 7 13 5 x 7 13/5 x 5 5 13 7 - *
