7x 2 1 5 4x July 8, 2019 16 32 64 128 1 2 5 7x 8 4x 6 1 2 4x 5 6 7x 6x 2x 3 1 )-( 7x 2 5 4x 3 5 4x 2 1 7x 3 7x 5 3 4x 1 2 0 2 7x 1 )+ 5 4x 2 )= 9 7x 3y 5 1 4x y =- 8 2 2x 7
