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\frac{-12-\sqrt{144-4-0\times 2\times 7}}{2-0\times 2}
Calculate 12 to the power of 2 and get 144.
\frac{-12-\sqrt{140-0\times 2\times 7}}{2-0\times 2}
Subtract 4 from 144 to get 140.
\frac{-12-\sqrt{140-0\times 7}}{2-0\times 2}
Multiply 0 and 2 to get 0.
\frac{-12-\sqrt{140-0}}{2-0\times 2}
Multiply 0 and 7 to get 0.
\frac{-12-\sqrt{140}}{2-0\times 2}
Subtract 0 from 140 to get 140.
\frac{-12-2\sqrt{35}}{2-0\times 2}
Factor 140=2^{2}\times 35. Rewrite the square root of the product \sqrt{2^{2}\times 35} as the product of square roots \sqrt{2^{2}}\sqrt{35}. Take the square root of 2^{2}.
\frac{-12-2\sqrt{35}}{2-0}
Multiply 0 and 2 to get 0.
\frac{-12-2\sqrt{35}}{2}
Subtract 0 from 2 to get 2.
-6-\sqrt{35}
Divide each term of -12-2\sqrt{35} by 2 to get -6-\sqrt{35}.