Equation is related to Result. Result is related to Find. Find is a synonym of Recover. Recover is a synonym of Regain. 
Reserve is related to Later. Later is the opposite of Early. Early is related to Egg. 
Equation <--RelatedTo--> Result <--RelatedTo--> Find <--Synonym--> Recover <--Synonym--> Regain 
Reserve <--RelatedTo--> Later <--Antonym--> Early <--RelatedTo--> Egg 