Work Step by Step
We can call our unknown number "$x$". The difference between a number and 6 can be written as $x-6$ and doubling that would give $2(x-6)$. (Remember to add the parenthesis.) So, $2(x-6)=30$
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.