Finding power series of function could anyone help me answer question?
$$F(x)=\ln\left(\dfrac{7+x}{7-x}\right)$$ Find a power series representation for the function.

When I was young (that is to say a loooong time ago), one of the series the professor asked us to always remember (because of its extreme simplicity) is precisely $$\ln\left(\frac{1+x}{1-x}  \right)=2\sum_{n=0}^{\infty}\frac {x^{2n+1}}{2n+1}$$ Thank you for remembering me my youth
