each of the regions a, b, and c bounded by the graph of f and the x-axis has area 3. find the value of

We'll first simplify both sides of the expression to get (simply using the distributive property):


Then, we can simplify a little bit:


To solve for n, we have to isolate it. Let's subtract 3n from both sides to further simplify it:


Then, add 18 to both sides to get the value of n:


And that's your answer. If you have questions on how I got that, feel free to ask!