exam Maths Puzzle Numerical Ability

9x-8=5x
Can someone help me with this.

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exam Other Question

With a certain tail wind a jet air craft arrives at its destination 1,890 miles away in 3 hours. Flying against the same wind, the plane makes the return trip in 3 3/8 hours. Find the windspeed and airspeed. What exactly is a discrimanent? (sorry about the spelling)