Latisha has received another strange message from her Great Aunt Zelda. Can you help Latisha solve the strange equation found in the letter?

Latisha has received another strange message from her Great Aunt Zelda. Can you help Latisha answer her strange Great Aunt?

Latisha has received a strange message from her Great Aunt Zelda. It was found in a normal envelope but the writing doesn't make any sense. Can you help Latisha solve this riddle?