What’s the four digit code?

Answer this question, only if you know the answer. 30 points and brainliest!

What is the anwers for 9+2x=5x-3-x

Onnie is considering doing some long term investing with money that she inherited. she would like to have $50,000 at the end of 30 years. approximately how much money would lonnie need to put into an account earning 6% interest compounded annually in order to meet her goal?