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Let's try one.

30x2y3z4 + 42x4y5z2

Do the numbers first.

Factor them.

2 x 3 x 5 = 30

2 x 3 x 7 = 42

Select the common factors.

2 x 3 = 6

For the variables, select the lowest exponents.

The GCF of the above expression is 6x2y3z2

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Q: How do you find the Greatest Common Factor of an algebraic expression?
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