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b. 2x²+6y²-15+6x²-7y²+9
= 2x pangkat 2 +6x pangkat 2 +6y pangkat 2 -7y pangkat 2 -15 +9
= 8x pangkat 2 -y pangkat 2 -6
maaf kalo jawabannya salah
b)
2x² + 6y² - 15 + 6x² - 7y² + 9
8x² - y² - 6