HT$17$

$9..$ is $($I$-$X$)(-2)($a$)\{77,90,85,62,37\}($b$)(0,-4,5,-11,12,18,2\}$ XLX$-777-90\mathrm{.}2-6\mathrm{.}8$ ao la$0-70\mathrm{.}2=19\mathrm{.}8.85/85-70\mathrm{.}2=14\mathrm{.}8$k $626770-2-237\mathrm{.}9023-35\mathrm{.}2$