3 7x=9 July 8, 2019 16 32 64 128 3 7x 9 3 7x 9x 2 3 7x )( 9x 1 3 7x =- 9 28 3 7x 9x 3 7x 9 8x 3 7x 90 135 3 7x 90 3 7x 9 15 3 7x 9y 6 7x 3 9x 21 7x 3 9x 5 7x 3 9x 7 7x 3 9 4 7x 3 9x 4
