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You are given the expression 30x4y3 − 12x3y.

Part A: Find a common factor for the expression that has a coefficient other than 1 and that contains at least one variable. (1 point)

Part B: Explain how you found the common factor. (1 point)

Part C: Rewrite the expression using the common factor you found in Part A. Show every step of your work. (2 points)