If someone could tell me the equation to set up the problem for me it would be great! My teacher didn’t go over how to solve it when the equation is on both sides. And if you could explain why would be totally amazing!

Alana has 12.5 cups of flour with which she is baking four loaves of raisin bread and one large pretzel. the pretzel requires 2.5 cups of flour to make. how much flour is in each loaf of raisin bread? explain the steps to follow to get the answer.