Let P = 10x2 - 8y2 + 5xy,

Q = 12xy + 10y2 + 3x2

and R = 8y2 - 3x2 + 4xy

Then, (P - Q) + R =

1
4x2 + 10y2 - 3xy
2
4x2 - 10y2 - 3xy
3
4x2 - 10y2 + 7xy
4
4x2 - 26y2 - 11xy

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