documentclass{article}
usepackage[urw-garamond]{mathdesign}
begin{document}
blindtext
  A formula:
  [
    underbrace{frac{sin^{2}vartheta}{Theta_{lm}(vartheta)}left(frac{partial^{2}}{partialvartheta^{2}}+frac{cosvartheta}{sinvartheta}frac{partial}{partialvartheta}right)Theta_{lm}(vartheta)+sin^{2}(vartheta)(l(l+1))}_{m^{2}}=underbrace{-frac{1}{Phi_{m}(varphi)}frac{partial^{2}}{partialvarphi^{2}}Phi_{m}(varphi)}_{m^{2}}
  ]
  and another one:
  [
    P_l (x)equivfrac {1}{2^l}sum_{k=0}^{lfloor l/2rfloor} (-1)^k frac{(2l-2k)!}{k!(l-k)!(l-2k)!} x^{l-2k}
  ]
end{document}

!pdfTeX error: /usr/texbin/pdflatex (file ugmr8a.pfb): cannot open Type 1 font
file for reading
 ==> Fatal error occurred, no output PDF file produced!

fmtutil-sys

 updmap-sys

 getnonfreefonts-sys

sudo getnonfreefonts-sys garamond garamondx

kpsewhich pdftex.map

/usr/local/texlive/2014/texmf-var/fonts/map/pdftex/updmap/pdftex.map

curl --remote-name https://tug.org/fonts/getnonfreefonts/install-getnonfreefonts

sudo texlua install-getnonfreefonts

sudo -H mktexlsr

sudo -H updmap-sys --force --enable Map=newfont.map

sudo texlua install-getnonfreefonts