Lisa is cooking muffins. The recipe calls for 7 cups of sugar she already has put in 2 cups how many more cups does she need to put in? write the equation that matches this situation and solve

Okay, here we have this:
Considering the provided information we obtain that:
Cups Missing = Total Cups - Cups Added
Replacing:
Cups Missing = 7 cups - 2 cups
Cups Missing = 5 cups.
Finally we obtain that she needs 5 more cups of sugar.