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perixwinkle
Let's try to solve on our own and then look at our options. We need to add, since it says sum, two polynomials.
It would look like:
(2x-5y)+(x+y)
Let's start with x.

2x+x=3x
Now y.
-5y+y=-4y
We need to put 3x and -4y together.

The expression would look like 3x-4y, which is A.

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