simplify the following-----
7x'tothepower3'y + 9yx'tothepower3'
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(7x)^3+(9yx)^3
=(7x+9yx)[(7x)^2+(9xy) ^2+63x^2y]
=(7x+9yx)[(7x)^2+(9xy) ^2+63x^2y]
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