###### Example2.3.4

If a number minus \(2\) is \(6\text{,}\) what is the number? This time, we should be able to *add* \(2\) to \(6\) to get the unknown number. So the unknown number is \(6+2=8\text{.}\)

If a number minus \(2\) is \(6\text{,}\) what is the number? This time, we should be able to *add* \(2\) to \(6\) to get the unknown number. So the unknown number is \(6+2=8\text{.}\)