17. What should be subtract from 9x- y' + 6xy to get 2x -y - 2xy?
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Answer:
a = 7x + 8xy
Step-by-step explanation:
Let the number be a
==: 9x - y + 6xy - a = 2x - y - 2xy
==: a = 9x - y + 6xy - 2x + y + 2xy
==: a = 7x + 8xy
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