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