9 7 8 2 3 4 July 8, 2019 16 32 64 128 X 7 8 9 4 2 3 9 8 7 6 5 x 4 3 2 1 2 7 8 trimethyldecane or 3 4 9 trimethyldecane Tìm x x - 7/8 = 9/4 - 2/3
