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In this example we will make
5x = A
4 = B
7 = C

(A-B) (A+C)

What will happen is that we will times together A and A, A and C. B and A, then B and C

Which will get us to: 25x² + 35x - 20x - 28

Add all shared numbers which will be in this case: +35x and -20x

35x-20x = 15x

Add that number back into the equation, now making:

25x² +15x - 28
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