Predict the result
Solve w minus eight equals negative fifteen.

Set up the model
Add eight to both sides to preserve equality.
Then check the result in the original equation.

Work the example
Negative fifteen plus eight is negative seven.
The solution is w equals negative seven; subtracting eight gives negative fifteen.

Check the result
Solve y minus one sixth equals two thirds.
Take eight seconds to think before the answer appears.
[Eight-second silent pause to work; the answer remains hidden.]
Adding one sixth gives y equals five sixths.

Interpret the result
An inverse operation must be applied to both sides of the equation.