Question: simplify sum

Hello,

 

how to simplify lhs(eq) to get rhs(eq)?

eq:=y*(sum(a[n]*y^(n-2)*n*(n-1), n = 0 .. infinity)) = (sum(a[n]*y^(n-1)*n*(n-1), n = 0 .. infinity));

is(eq);    

Regards

Jerzy

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