Evaluate
\frac{5\left(\sqrt{13}+\sqrt{39}-3\right)}{2}\approx 17.126373185
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\frac{5\left(-3+\sqrt{39}+\sqrt{13}\right)}{2}
Subtract 1 from -2 to get -3.
\frac{-15+5\sqrt{39}+5\sqrt{13}}{2}
Use the distributive property to multiply 5 by -3+\sqrt{39}+\sqrt{13}.
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