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\[x^2+6x-7=0\]
\[(x+7)(x-1)=0\]

http://www.wolframalpha.com/input/?i=x%5E2%2B6x%3D7

\[x^2+6x-7=0\]\[(x+3)^2-3^2-7=0\]\[(x+3)^2-16=0\]\[(x+3)^2=16\]\[x+3=\pm 4\]\[x=1 , -7\]