x²-14x+49-a²-12a-36, Factorize the given equation.
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x^2-14x+49-a^2-12a-36
=(x^2-14x+49)-(a^2+12a+36)
=(x-7)^2-(a+6)^2
=(x-7+a+6)(x-7-a-6)
=(x+a-1)(x-a-13)
=(x^2-14x+49)-(a^2+12a+36)
=(x-7)^2-(a+6)^2
=(x-7+a+6)(x-7-a-6)
=(x+a-1)(x-a-13)
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