2 x 7 1 5 x 2 6 July 8, 2019 16 32 64 128 6 2 5 x 2 7 x 4 1 3 X3 2x 1 5 7 2 x 2 x 6 3x 4 2 x 7 )= 5 x 1 )+ 6 2 x 2 x 2 5 2 7 x = −5 1 7 2x 7 2 x-7≤5
