exam Maths Puzzle Numerical Ability

please help me solve this
1/x+3+1/x-3=1/x^2-9

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exam Other Question

Two cars leave town at the same time going in the same direction on the same road. One travels 30 mi/h and the other travels 46 mi/h. In how many hours will they be 72 miles apart?
THANK YOU! Montrose and Salem are 10 miles apart. Karen lives 12 miles from Salem. What are the possible distances Karen lives from Montrose?