# math equation are displaying wingdings for symbols [SOLVED]

so I've been writing math equation on libreoffice to write my math lessons but at some point when I opened text document with math equations I realized this

I don't know how to fix this and I need help

edit : I use window 10 and this is a .odt

thanks in advance

Looks like missing OpenSymbol font

And to complicate matters, you don't tell your OS nor how you saved your file (

.odtor.doc(x)).