Cognitive Tutor Algebra 1 HELP!?

Im on Unit 20 and this is the problem it gave me, gr + 5n= yf + rf
I click the hint button and it tells me to Factor out the equation, But i have no clue what that means. So I clicked the "Factor: Common Factor: button and type in yf + rf and it says it correct but it doesnt do anything to the equation. Every other button I hit says it's wrong! Please Help! D;
sorry about the category lol.
 
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