numbering all lines of an array

I know there are already many topics about that but I couldn't find an appropriate answer (most of the time the given solutions are not adapted to my case). Here is my code (some command have been renamed) :
\begin{subequations}
\begin{array}{rcll}
\dint_{K} \underline{E}_h \cdot \underline{z} dx + \dint_{K}\Phi_h \nabla\cdot \underline{z} dx -\dint_{\partial K} \lambda_h \underline{z} \cdot \underline{n} d\sigma & = & 0, & \forall\  \underline{z}_h \in\mathbb{Q}^k(K), \\[4mm]
\dint_K \nabla \cdot \underline{E}_h p dx & = & \dint_K (1-\rho)p dx, & \forall\  p \in \mathbb{P}^k(K), \\[4mm]
\dint_e \ldbrack \underline{E}_h \rdbrack \mu d\sigma & = & 0, & \forall\ \mu\in\mathbb{P}^k(e).
\end{array}
\label{eq:Poisson-RT
\end{subequations}
I would like to keep the vertical alignment (all the \forall one above the other...) and have a numbering like
... (1.a)
... (1.b)
... (1.c)
I tryed with subequation and align but the alignment is not the one expected and array is not compatible with subequation. eqnarray could be acceptable if it did not place characters on top of each other.
Thanks for your help, sorry for the mistakes and I hope I don't make you loose your time because I haven't found an already published answer to my problem.
Éric