Factor 21b+7-3ab-a - Math help

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$21 b + 7 - 3 a b - a$

Factor out the greatest common factor from each group.

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Group the first two terms and the last two terms.

$(21 b + 7) - 3 a b - a$

Factor out the greatest common factor (GCF) from each group.

$7 (3 b + 1) - a (3 b + 1)$

$7 (3 b + 1) - a (3 b + 1)$

Factor the polynomial by factoring out the greatest common factor, $3 b + 1$ .

$(3 b + 1) (7 - a)$

Factor 21b+7-3ab-a

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