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= 5y²+4y²-y²-3y+y+x²-1
=8y²-2y+x²-1
ni...kakak bantu lagi....:)
5y² - 3y + 4y² + x² - y² + y - 1
=x²+ 5y²+4y²-y²-3y+y-1
=x²+8y²-2y-1