Work Step by Step
Whenever you multiply an expression by a constant, you must cancel it out by multiplying by its reciprocal. Thus, since it is multiplied by 1/2, the blank must be $2$.
You can help us out by revising, improving and updating this answer.Update this answer
After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.