The following is my code for solving a simple equation $$\sum_{n=1}^{10}100(1+x)^{4n}=5\cdot \sum_{n=1}^{5}100 (1+x)^{4n}$$ However, my code only returns one solution x=-1, assuming that I only want real solution. I know there is another solution close to $x=0.071773$.
I tried using x, [0 Inf] but the code just simply cannot find a solution.
A lot appreciated for any assistance.
