Question: Factorising expressions in maple

ifplease how can i factorise in powers of (x-xn), the expression  y(t):=(1/3h2)[(-x+xn+h)(-x+xn+3h)]yn+(1/3h2)[(-xn+x)(-x+xn+4h)]yn+1 -(1/3h)[(-xn+x)(-x+xn+3h)]fn+2?

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