4 (- 7 )- 5 (- 3 )=- 13 July 8, 2019 16 32 64 128 4 7 1 3 z 13 14 5 8 2x 7 5 4x 3 4 28x 13 20 4 3x 5 7 x 3 13 3 0 3 4x 7 )- 4 5 3x )= 10x 13
