d. 8x + 7xy - 6y
5x + 3xy - 4y + 3x + 4xy - 2y
= 5x + 3x + 3xy + 4xy - 4y - 2y
= 8x + 7xy - 6y
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d. 8x + 7xy - 6y
5x + 3xy - 4y + 3x + 4xy - 2y
= 5x + 3x + 3xy + 4xy - 4y - 2y
= 8x + 7xy - 6y