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x²;-x=1 x²;-x+1/4=1+1/4 (x-1/2)²;=5/4 x-1/2=±√5/2 x=(1-√5)/2,x=(1+√5)/2 y²;+5y=84 y²;+5y+25/4=84+25/4 (y+5/2)²;=361/4 y+5/2=±19/2 y=-12,y=7
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