What must be added to xy - 4x + 2y to get 9xy - 3x - 4y?
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Answer: 8xy + 1x - 6y
Step-by-step explanation: 9xy-3x-4y - [xy-4x+2y]
9xy-xy-3x+4x-4y-2y = 8xy +1x -6y
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