In the formula `k=((a-b)/(a+b))^(2)`, find the value of b if `k=36` and a=3, making b the subject.

In the formula `k=((a-b)/(a+b))^(2)`, find the value of b if `k=36` and a=3, making b the subject.
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In the formula `k=((a-b)/(a+b))^(2)`, find the value of b if `k=36` and a=3, making b the subject.
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