Find the removable discontinuity of the equation f(x)=x^2-4x+3over x^2-9. There is also a picture of the equation i added to the question. Please show solving steps.

Big Ideas Math A Bridge To Success Algebra 1: Student Edition 2015
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ISBN:9781680331141
Author:HOUGHTON MIFFLIN HARCOURT
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Chapter5: Solving Systems Of Linear Equations
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Find the removable discontinuity of the equation f(x)=x^2-4x+3over x^2-9. There is also a picture of the equation i added to the question. Please show solving steps. 

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