4 8x 7 ) 2x 38 x July 8, 2019 16 32 64 128 4 8x 7 )+ 2x 38 x 8 2x-4 4x=38 38 4 7x-1 8=3 2+2 2x 4 7-8x=4 9-8x 2 7x-2 8=4 2-4 3x