| Answer | Crossword Clue |
|---|---|
| VAR | X, in an equation: Abbr. |
| VALUE | "x" in an equation |
| VARIABLE | X or Y, in an equation |
| DDS | Professional with an x-ray machine: Abbr. |
| VOL | W-X-Y-Z for an encyclopedia, maybe: Abbr. |
| MASS | Word in an Einstein equation |
| OPERAND | Part of an equation, in math |
