Evaluate
-4\pi \approx -12.566370614
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14\pi -3\times 3\pi \times 2
Multiply 2 and 7 to get 14.
14\pi -9\pi \times 2
Multiply 3 and 3 to get 9.
14\pi -18\pi
Multiply 9 and 2 to get 18.
-4\pi
Combine 14\pi and -18\pi to get -4\pi .
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