Factorize:
27(3x-y)^5-6(3x-y)^7
Is the answer:
3(3x-y)^5(9-6x+y)?

Dear student
27(3x-y)5-63x-y7=3(3x-y)59-23x-y2=3(3x-y)59-29x2+y2-6xy    a-b2=a2+b2-2ab=3(3x-y)59-18x2-2y2+12xy
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