Question: The lowest common denominator that can be used when adding 5 x + 1 5 ( x + 3 ) ( x + 5 )

The lowest common denominator that can be used when adding 5x+15(x+3)(x+5)+4x-12(x+3)(x-3) is N, where N is an expression in x.
What is the value of N if x=4?

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