book Maths Puzzle Numerical Ability

Solve for x:

ln(7-x)+ln(3x+5)=ln(24x)

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book Other Question

a cyclist bikes x distance at 10 miles per hour and returns over the same path at 8 miles per hour. What is the cyclist average rate for the round trip in miles per hour. f(x)=3^X, find the value of X that makes f(x)=17, then explain how you know the answer must be between 2 and 3