Describe the steps you would use to factor 2x^3+5x^2-8x-20 then state factored form

Based on what i know about mean, this doesn't add up.

One month, a music site observed that 60% of the people who downloaded songs from its site downloaded q sam's latest single. the equation below represents this information, where x represents the total number of people who ddownloaded songs from the site that month: x = 0.6x + 384 how many people who downloaded songs from the site that month downloaded q sam's latest single?

Can someone me do math because i am having a breakdown rn because i don’t get it