How are singularity functions used in beam analysis?

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hatchelhoff
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HI
I am going through an example on signularity functions.
I don't understand how the author went from the line which I highlighted in blue to the line which I highlighted in red.
upload_2017-5-6_12-22-9.png
 
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Hope this helps
upload_2017-5-6_13-24-6.png
 

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