Question: Substitution of a variable or simplification

Hello people in Mapleprimes,

I have an expression which I want to modify with another equation.

They are simple, and looks easy to simplify.

nb:=(k-sigma+1)*lambda*L*(gamma*upsilon-delta__1122^k*tau)*upsilon*tau*v/(f__F*sigma*(-tau^2+upsilon^2)*k);

hh := (L*lambda*(k-sigma+1)*upsilon*tau*v)/(f__F*sigma*(-tau^2+upsilon^2)*k)=rho;

I want to express nb with hh as

(gamma*upsilon-delta__1122^k*tau)*rho;

With the next code, that modification can be done.

isolate(hh,f__F);subs(%,nb);simplify(%);

But, this isolates hh for f__F, which does not look intuitive.

On the other hand, the outcome of the substitution looks so simple, which you find with executing  the codes of

nb, and hh.

But, algsubs, and subs, and simplify/siderel won't work properly.

What I want to ask is this. Isn't there any nice way to substitute hh into nb other than isolating f__F, so that the result is expressed with rho?

I will be very glad if you will give me answers.

Best wishes.

taro