MHB Evaluating/Simplifying an Expression

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Part f. is the only expression I am unsure of what steps to take to get the correct answer.

Would anyone be willing to give me an idea?
 

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I went ahead and tried it, but I'm still uncertain if I am on the right track.
 

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Why did you stop at \frac{4h}{x+ h- x}? You are aware that x+ h- x= h, aren't you?
 

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