9/8n=-54 solve for n
$$\\\frac{9}{8}n=-54\\\\ \frac{9}{8}n\times\frac{8}{9}=-54\times\frac{8}{9}\\\\ n=-6\times\frac{8}{1}\\\\ n=-48$$
$${\frac{{\mathtt{9}}}{{\mathtt{8}}}}{\mathtt{\,\times\,}}\left(-{\mathtt{48}}\right) = -{\mathtt{54}}$$
n = -48