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3. Which expression is equivalent to (6x*y - 2x"y? - 7xy+19) - (-8xy + 14x*y - 13x”y?+ 10)?
a.--8x*y + 11x2y2 + xy + 9
b. 8x*y - 11x*y2 - xy - 9
c. 20x'y - 15x+y2 - 15xy? + 29
d. -20x'y + 15x?y? + 15xy? - 29