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ac + 2ad + 2bc + 4bd

(ac + 2ad) + (2bc + 4bd) group the figures

a(c + 2d) + 2b(c + 2d) remove the common divisors of each set

(a + 2b)(c + 2d) take the figures in parentheses as one set, and add the outside figures as the other

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15y ago

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