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77x + 21

We need to find the common factor between the coefficient and the constant.

77 ÷ 7 = 11
21 ÷ 7 = 3

7(11x + 3) is the factor of 77x + 21.

7(11x + 3) can be expanded using the distributive property of multiplication.

7(11x) + 7(3) = 77x + 21

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