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3-15.

Flip subtraction to addition.

x + 3x + (−3) + 2x² + 8 + (−5x)

Combine like terms.

Remember that you cannot combine x and x².

x + 2x² + 5

See the hint in part (a).

Remember that xy cannot be combined with x or y.

See the hints in part (a).

2x² + (−3y²) + 4xy + 30y + (−x) + (−14)

See the hints in part (a) and part (c).