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Find the length of cu, the triangles are similar.

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?

If f(x)=3x+1 and f^-1=x-1/3, then f^-1(7)=