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Question: How to simplify a function?

Question:How to simplify a function?

clementine 10 Maple
simplification denominator
January 23 2018
1

I have the following maple code. 

R11 := x -> (x+2*a_1)*(product(x+b[j], j = 1 .. k-n))/(x+a_1);

T_4 :=  (z_1, z_2, z_3, z_4) -> R11(z_1)*z_2*z_3*z_4;

%*(z_1+a_1);

I would like maple to simplify (z_1+a_1) in the denominator of R11(z_1) with the (z_1+a_1) from the last line, but it does not do that. Simplify command also does not help.
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