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3. Add: (3x + 4xy + 4y). (5x + 6xy + 6y?) and (6x² + 5xy + 8y?)
A. 14x + 15xy - 18y?
B. 14x15xy + 18y
C. 14x² - 15xy - 18y
D. 14x. 15xy - 18y​