(v) 5x+y – 5x + 3yx – 3y2 + x2 - y2 + 8xy – 3y2
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5x+y – 5x + 3yx – 3y² + x²- y² + 8xy – 3y²
= x² -3y²- y²-3y² + 8xy + 3xy + 5x - 5x +y
= x² - 7y² + 11xy +y
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