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