I have to use a line break in my equation. But the content in the extra line is squashed to the right. But If I try aligning it with "&" all the content gets massively pushed to the right.
Here is the code without alignment:

```
\begin{align*}
  \phi_{ij}^{(k+1)} =\underset{\phi_{ij} \in \mathbb{R}^k}{\argmax} \langle \phi_{ij}, (\nabla\cdot(2u^{(k+1)}-u^{(k)}))_{ij} - (\nabla_G\cdot(2w^{(k+1)}-w^{(k)}))_{ij} - \lambda^0_{ij}+\lambda^1_{ij}\rangle \\
   - \frac{1}{2\tau}(\phi_{ij} -\phi_{ij}^{(k)})^2  \\
   \Rightarrow 0 \overset{!}{=} (\nabla\cdot(2u^{(k+1)}-u^{(k)}))_{ij} - (\nabla_G\cdot(2w^{(k+1)}-w^{(k)}))_{ij} - \lambda^0_{ij}+\lambda^1_{ij} \\
   + \frac{1}{\tau}(\phi_{ij} - \phi^{(k)}_{ij}) \\
   \phi^{(k+1)}_{ij}:=\phi_{ij} = \phi_{ij}^{(k)} + \tau ((\nabla\cdot(2u^{(k+1)}-u^{(k)}))_{ij} \\
   - (\nabla_G\cdot(2w^{(k+1)}-w^{(k)}))_{ij} - \lambda^0_{ij}+\lambda^1_{ij})
\end{align*}

```

This is the best I can do. But in red I marked, what I actually want to do.
[![enter image description here](https://i.stack.imgur.com/dExMv.png)](https://i.stack.imgur.com/dExMv.png)