On the Subject of Emoticon Math

$*,7

Decipher the emojis on the display into numbers and a symbol and solve the answer to the question. Enter the answer with the keypad and press ‘=’ to submit it. Use ‘-’ to toggle the negative sign for negative answers. There’s no delete button so press those buttons carefully!

For example: %?$ translates to 1+1

EmojiNumber
! or " or #0
$ or % or &1
' or ( or )2
* or + or ,3
- or . or /4
0 or 1 or 25
3 or 4 or 56
6 or 7 or 87
9 or : or ;8
< or = or >9
EmojiSymbol
? or @ or A+
B or C or D-
E or F or Gx