Seems like a basic math equation but I seem to have forgotten how to solve it.

I am trying to calculate the IRR of an investment and I have the equation, please check below and please provide step by step answer so I am able to do it myself later on. The answer of the equation is also given in the picture below, I need steps to that answer.

Thanks

+ r $29.5 million $102.5 million = 0 1 + r Solving for the unknown r: r: IRR = 23.34%