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You use the distributive property. That is, you look for a common factor, divide each of the terms within parentheses, brackets, or whatever by this common factor, and write the common factor once outside the parentheses. For example:

10x + 15y

Here you have a common factor of 5, so you can take this factor out:

10x + 15y

= (10x + 15y)

= 5(2x + 3y)

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Q: How extract common factors from brackets?
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