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Where did 12x go when factoring the numerator? (I'm not from an English speaking country, so sorry if I used the wrong words, but I hope you'll understand anyway)

Where did 12x go when factoring the numerator? (I'm not from an English speaking country-example-1
User Youjin
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The first step factored both of the equations (on the too and bottom if the fraction)
User Mistertee
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