Expand
28f^{14}-784ef^{13}+10192e^{2}f^{12}-81536e^{3}f^{11}+448448e^{4}f^{10}-1793792e^{5}f^{9}+5381376e^{6}f^{8}+21525504e^{8}f^{6}-28700672e^{9}f^{5}+28700672e^{10}f^{4}-20873216e^{11}f^{3}+10436608e^{12}f^{2}-3211264e^{13}f-12300288\left(ef\right)^{7}+458752e^{14}
Evaluate
28\left(2e-f\right)^{14}
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