15 6 x 4 3 0 9 July 8, 2019 16 32 64 128 15 6 chia x 4 3 0 9 15 x 4 )- 3 x 9 )+ 5 x 6 )= 0 15 /9 ×6 15/4 x 5 15 x 4.6 3 15 x 4
