Really need
eighty decreased by three times a number os the same as five times the number increased by eight find the number
i am really confused

Asurvey of 45 teens found that they spent an average of 25.6 hours per week in front of a screen (television, computer, tablet, phone, based on the survey’s sample mean, which value could be the population mean? 2.3 hours 27.4 hours 75.3 hours 41.5 hours

I’m stuck on this equation, anyone got the answer?

Write an equation of the line that passes through 9,2 and is parallel to the line y=5/3x+9