factorise: 27xcube-(3x-y) the whole cube
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(3x)^3-(3x-y)^3={3x-(3x-y)}{9x^2+(3x-y)^2+3x. (3x-y)}
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Answer:
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rh ynwt dcr d
rh.dh.sg
DH.wtmhe
eg.rh
St.dh.xv.,v eg.fj
dh
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