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16-10-2014
Mathematics

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how to factor 21-7t+3r-rt

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16-10-2014

21- 7t + 3r - rt
Group:
(21- 7t) + (3r - rt)
Factor out the common factors:
7 (3 - t) + r (3 - t)
Use the distributive property:
(3 - t) (7 + r)

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