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gcf(35x², 7xy², 21x²y²) = 7x

35x² = 5 times 7 times x²

7xy² = 7 times x times y²

21x²y² = 3 times 7 times x² times y²

hcf = 7 times x = 7x

(I've written the multiplication as times instead of using the × symbol to avoid confusion with the unknown x.)

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