4x =- 8 (- 2x 7 ) 20 July 8, 2019 16 32 64 128 4x =- 8 (- 2x 7 )+ 20 2x 7 4 2x + 8 = 8 - 7x 4 7x-1 8=3 2+2 2x 2 7x-2 8=4 2-4 3x
