Evaluate
24-2\sqrt{2}\approx 21.171572875
Factor
2 {(12 - \sqrt{2})} = 21.171572875
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-4\sqrt{2}+24+2\sqrt{2}
Multiply 3 and 8 to get 24.
-2\sqrt{2}+24
Combine -4\sqrt{2} and 2\sqrt{2} to get -2\sqrt{2}.
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