3 5x 1 2 1 7 July 8, 2019 16 32 64 128 5x 3 1 2 7 6 5x 1 x 1 2 7x 3 $3 x 1 5x 1 7 2 x )$ 3 1 5x 7 2 3 1 3 4 4 3 7 5x 1 2 4 9 )- 1 5 3 5x 1 2 70 3 5x 1 2 7 10 2 5x 1 1 7x 3 8 1 3 5x 4 )- 1 2 x 7 )= 11 3 x-5=x+3
