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Explain why each calculation is incorrect.

$\dfrac{x-6}{x-9} \rightarrow \dfrac{x-2}{x-3}$
A) 3 is not a factor of numerator or denominator.
B) More cancelling is required.

$\dfrac{2x+5}{2} \rightarrow x+5$
A) 2 is not a factor of the numerator.
B) 2 should be subtracted from 5.

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