I don't know what was done to get the line starting with i.e.
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pull out the common factors ...
I don't know how the next line was made.
For any numbers a and b, so I think that is what you are refering to but, of course, I can't be certain what you mean by "the next line".
I understand that. I don't understand how the second line becomes the 3rd line.
pull out the common factors ... distribute ... combine like terms ...
Thanks. I was misreading the equation.
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