Help please I dont understand

Question

The calorie count of a serving of food can be computed based on its composition of​ carbohydrate, fat, and protein. The calorie count C for a serving of food can be computed using the formula C=2h+9f+2p, where h is the number of grams of carbohydrate contained in the​ serving, f is the number of grams of fat contained in the​ serving, and p is the number of grams of protein contained in the serving. Solve this formula for​ f, the number of grams of fat contained in a serving of food.

The number of grams of fat f = ?

Answer 1

C=2h+9f+2p is the formula for total calories based on carbohydrates, fat and protein combined.

If you want to find the number of grams of fat for some calorie count, you need to first rearrange the terms in the given formula to isolate the f-term on one side of the equals sign:

C - (2h+2p) = 9f

Divide both sides by 9 to get the solution for f:

[C - (2h+2p)] / 9 = f

This can be written a bit more neatly as [C - 2(h+p)] / 9 = f