Is this right ?
(2x-8)(2x+1)=x^2-16
2(x-4)(2x+1)=(x-4)(x+4) l /x-4
2(2x+1)=x+4 l -x+4
4x+2-x+4=0
3x+6=0 l -6
3x=-6 l /3
x=-2

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Yes .-.

seems unlikely but maybe

Following me around again @satellite73

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