Evaluate
21\sqrt{6}+9\approx 60.439284598
Factor
3 {(7 \sqrt{6} + 3)} = 60.439284598
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9+\frac{63}{3}\sqrt{6}
Multiply 7 and 9 to get 63.
9+21\sqrt{6}
Divide 63 by 3 to get 21.
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