SOLUTION: {{{((15/x)-5)/(x-3)}}}, simplify with rationalizing and substitute in 3 for x. The answer key says it is {{{-5/3}}} but I don’t know how to get there

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Question 1122227: , simplify with rationalizing and substitute in 3 for x. The answer key says it is but I don’t know how to get there
Found 2 solutions by josgarithmetic, MathTherapy:
Answer by josgarithmetic(39617)   (Show Source): You can put this solution on YOUR website!
Nothing to rationalize; no irrational numbers, no irrational expressions present.

If you substitute 3 for x, then your denominator there is 0, which is impossible.
Answer by MathTherapy(10552)   (Show Source): You can put this solution on YOUR website!
, simplify with rationalizing and substitute in 3 for x. The answer key says it is but I don’t know how to get there
As it is now, 

However, SIMPLIFYING the expression will result in: .

When 3 is substituted for x in this SIMPLIFIED FORM, you'll get:  

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