Evaluate c/2 -3 + 6/d when c=14 and d=3

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?

To determine the number of deer in a forest a forest ranger tags 280 and releases them back

[10 points, algebra 2]according to my answer key the restrictions are -1 and 4. but why not positive 1?