please solve for x : x²+6x-(a²+2a-8)=0
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x^2+6x+9-9-(a^2+2a-8)=0
(x+3)^2-(a^2+2a+1)=0
(x+3)^2-(a+1)^2=0
(x+3+a+1)(x+3-a-1)=0
(x+a+4)(x-a +2)=0
x+a+4=0
x=-a-4
x-a+2=0
x=a-2
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