Look at the expression.
3x -8y +2x^2 +3y -8x
Add up all the x-squareds . . . there are 2 of them
Add up all the Xs . . . 3x - 8x = -5x
Add up all the Ys . . . -8y + 3y = -5y
Add up the collection: 2x^2 -5x -5y
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