I don't think this can be done in terms of elementary functions

Pull out 1/7 to getand

Making the substitution to transform the integral into

You did it right. When you pull out the constant, it doesn't matter if you multiply it back in once you've integrated of multiply it to the value of the definite integral. You should get the same answer.Another question I have is about definite integrals. When you pull a constant to the left of the integral, do you have to multiply the constant by each function or just to the final answer? For example:

Did I do that right?

Does this make sense? If you have additional questions, please post back.