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\sqrt{5}\sqrt{4}\sqrt{5}-\frac{\sqrt{63}}{\sqrt{7}}
Factor 20=5\times 4. Rewrite the square root of the product \sqrt{5\times 4} as the product of square roots \sqrt{5}\sqrt{4}.
5\sqrt{4}-\frac{\sqrt{63}}{\sqrt{7}}
Multiply \sqrt{5} and \sqrt{5} to get 5.
5\times 2-\frac{\sqrt{63}}{\sqrt{7}}
Calculate the square root of 4 and get 2.
10-\frac{\sqrt{63}}{\sqrt{7}}
Multiply 5 and 2 to get 10.
10-\sqrt{9}
Rewrite the division of square roots \frac{\sqrt{63}}{\sqrt{7}} as the square root of the division \sqrt{\frac{63}{7}} and perform the division.
10-3
Calculate the square root of 9 and get 3.
7
Subtract 3 from 10 to get 7.