8x 2 5x 4 )=- 12 July 8, 2019 16 32 64 128 8x 2 12x 4 )-( 2x 2 5x 2 8x 4 (- 5x 2 )= 12x 8x 2 12x 4 )-( 3x 2 5x 1 8x − 2 x 4 )+ 12 5x 10 X 4 5x 2 8x 12 2^x + 8^x = 130 8 ÷ 5/8