Answer
Add 6 to each side.
Work Step by Step
To solve an inequality, you need to isolate the variable on one side of the inequality.
$f-6\geq -3\longrightarrow$ add 6 to each side
$f-6+6\geq -3+6\longrightarrow$ add
$f\geq3$
You can help us out by revising, improving and updating this answer.
Update this answerAfter 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.