(7x-9y)³ .......... .....
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(343-729)^3 I hope it is right
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Answer:
(7x)³-4(7x)² (9y)+3x(7x)(9y)² -(9y)
343x³-3×49x²×9y+21x×81y²-729y³
343x³-147x²×9y+1701xy²-729y³
343x³-1353x²y+1701xy²-729y³
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