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Find the Greatest Common Factor (GCF) of the following pairs.

1. 12, 28c

2. 25x, 15xy

3. 42mn, 14mn

Factor the given Linear Expressions. If the expression cannot be factored, write "can't be factored."

4. 4x-28 4 x − 28

5. 3x+33y 3 x + 33 y

6. 4x+35 4 x + 35