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ANSWER:

=  \frac{30}{ \sqrt{20} +  \sqrt{5}  }  \\ \\   =  \frac{30}{2 \sqrt{5}  +  \sqrt{5} }  \\  \\  =  \frac{30}{3 \sqrt{5} }  \\  \\  =  \frac{10}{ \sqrt{5} }  \\  \\  =  \frac{10}{ \sqrt{5} }  \times  \frac{ \sqrt{5} }{ \sqrt{5} }  \\  \\  =  \frac{10 \sqrt{5} }{5}  \\  \\  = 2 \sqrt{5}



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