If only
There's a neat game you can play with the English language: Place the word "only" anywhere in the sentence. How does it change the meaning?
Only she told him that she loved him.
She only told him that she loved him.
She told only him that she loved him.
She told him only that she loved him.
She told him that only she loved him.
She told him that she only loved him.
She told him that she loved only him.
She told him that she loved him only.
What would it look like if we were trying to create a math problem that worked the same way, except "only" is replaced by the equals sign?