The difference between them is that the coefficients are different, and the latter is s larger than the former. They are all monomials of the letter s, the coefficients are: 6,7,8, and the three coefficients are consecutive one-digit integers. So :8-7=7-6=1, so :8s-7s=7s-6s=s. 8s:7s:6s=8:7:6. 8s*7s*6s=252s cubed.