1 2 x 9 x 6 x 9 July 8, 2019 16 32 64 128 1 /( x 3 2 9 /( x 3 2 6 x 2 9 0 2 3 2x 1 4 9 x 2 9 6 x 1 9 x 6 solve 9 x 2 1 /( x 2 )) 9 x 1 x 52 0 1/2 x 9 x 6 1/9 x 6 1 9 x 2