Add or subtract the following polynomials as indicated: (a) (6x + 9y) + (3x 8y) (b)

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Add or subtract the following polynomials as indicated:

(a) (6x + 9y) + (3x – 8y)

(b) (20x + 13y) – (4x + 7y)

(c) (12x – 17y) – (9x – 8y)

(d) (5x2 – 12xy + 3y2) – (2x2 + 9xy + 7y2)

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