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Factor out each term to get:

126 = 3 x 42

= 3 x 3 x 14

= 3² x 2 x 7

168 = 4 x 42

= 2² x 3 x 2 x 7

= 2³ x 3 x 7

210 = 10 x 21

= 2 x 5 x 3 x 7

So the GCF is 2 x 3 x 7 = 42 since that is the greatest multiple that divide 126, 168 and 210..

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Q: What is the gcf of -126 168 210?
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