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6a² -8a + 1 -2a = 7a² -10a
soal 2
= x²+8y²-16+16x²-7y²+11
= 17x² + y² - 5
6a^(2)+q^(2)-10=17x^(2)+y^(2)-5
6a^(2)+q^(2)=17x^(2)+y^(2)-5+10
6a^(2)+q^(2)=17X^(2)+y^(2)+5