2x7y-54x4y4 factorise
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2xy(x^6-27x^3y^3)
2xy((x^2)^3-(3xy)^3
2xy(x^2-3xy)(x^4+3x^3y+9x^2 y^2)
2xy((x^2)^3-(3xy)^3
2xy(x^2-3xy)(x^4+3x^3y+9x^2 y^2)
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