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(a-3)²-(a+4)(a-4)-6(3-a) = a²+9-6a-(a²-16)-18+6a = a²+9-6a-a²+16-18+6a = 7
b) (a - 3)² - (a + 4) (a - 4) -6 (3-a)=a² - 6a + 9 - a² + 16 - 18 + 6a =7
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