Here are the matches for the definitions and key words:
- Isolate the variable: To get the variable alone on one side of an equation or inequality.
- Inverse operation: Opposite operation.
- Equivalent equation: Equations that have the same solution.
If you're looking to fill in specific keywords, you could use "inverse operation" for "Opposite operation" and "equivalent equation" for "Squation that have the same" (assuming "Squation" was a typo for "equation").