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\sqrt{72+\frac{576}{8}}+\left(\sqrt{9}-\sqrt{4}\right)^{2}-\left(7+8-2-\left(5-4\right)\right)+6
Multiply 2 and 36 to get 72.
\sqrt{72+72}+\left(\sqrt{9}-\sqrt{4}\right)^{2}-\left(7+8-2-\left(5-4\right)\right)+6
Divide 576 by 8 to get 72.
\sqrt{144}+\left(\sqrt{9}-\sqrt{4}\right)^{2}-\left(7+8-2-\left(5-4\right)\right)+6
Add 72 and 72 to get 144.
12+\left(\sqrt{9}-\sqrt{4}\right)^{2}-\left(7+8-2-\left(5-4\right)\right)+6
Calculate the square root of 144 and get 12.
12+\left(3-\sqrt{4}\right)^{2}-\left(7+8-2-\left(5-4\right)\right)+6
Calculate the square root of 9 and get 3.
12+\left(3-2\right)^{2}-\left(7+8-2-\left(5-4\right)\right)+6
Calculate the square root of 4 and get 2.
12+1^{2}-\left(7+8-2-\left(5-4\right)\right)+6
Subtract 2 from 3 to get 1.
12+1-\left(7+8-2-\left(5-4\right)\right)+6
Calculate 1 to the power of 2 and get 1.
12+1-\left(15-2-\left(5-4\right)\right)+6
Add 7 and 8 to get 15.
12+1-\left(13-\left(5-4\right)\right)+6
Subtract 2 from 15 to get 13.
12+1-\left(13-1\right)+6
Subtract 4 from 5 to get 1.
12+1-12+6
Subtract 1 from 13 to get 12.
12-11+6
Subtract 12 from 1 to get -11.
1+6
Subtract 11 from 12 to get 1.
7
Add 1 and 6 to get 7.