I have this two integral equations which are an Hankel transform pair. I gotta combine them to find $A(k)$
$$ R^{n+{1}/{4}} \, \Sigma(R,t=0) \, = \, \int_0^\infty [A(k)\, k^{-1}] \, J_l(ky) \, k \, dk $$
and
$$ A(k)\, k^{-1} \, = \, \int_0^\infty [R^{n+{1}/{4}} \, \Sigma(R,t=0)]\, J_l(ky) \, y \, dy $$
My text says: combining them we obtain
$$ A(k) \, = \, \Bigl(1- \frac{n}{2}\Bigr)^{-1} \int_0^\infty \Sigma(y',0) J_l(ky') \, k \, R'^{\frac{5}{4}} dR' $$
Now I'd like to ask you how to reach this result combining them. I don't even get if the apex means derivation or it's just formal symbol used to point out the difference between $y'$ and $R'$. I don't even get how the integration switches from those variables to $R'$ in the last integral.
Thank you in advance for any kind of help.