5 6x 1 3 7 July 8, 2019 16 32 64 128 5 6x 1 )= 3 (- 7 2x 16 =- 5 1 6x )+ 3 6x 7 6x 5 7 2x 1 3 2 7x 1 )-( 6x 3 )= 5 32 3 6x 1 )- 5 4x 7 )= 5x 7x 14 5 6x 3 1 3 5 7 6x 1 8x 5x 2 1 4 6x 5 3 )= 7 6 3x 5 2 6x ≥ 1 3 8x 7 5 x 7 = 35 1-6x 10 5x-7 x-7