book Maths Puzzle Numerical Ability

13-3-6-1=

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One of the pitchers of the Chicago Cubs has a fastball that is electronically timed at 97.49 mph. Home plate is 17 inches long. How much time (in seconds) does the center of the ball take to pass directly over the plate? 8x + 15/x = 29

I need to show the work...I just know the answer is three but I cannot explain how I got there....HELP