X 9 7 2 July 8, 2019 16 32 64 128 X 9 7 27 X 7 9 21 X 9 )( 2x 7 9 x 7 20 9 x 7 25 X 7 9 2 3 X 7 9 2 18 X 9 2 7 5 9 x 2 7 8 10 x 9 7 2 Х 9 14 ) 7 2 5 9 x 7 1 2 9 x 7 x 2 y 3 9 x 7 21 - 3/7 x = 9/28
