Latex aligned in typst

[qres]

Is there a good way to get the effect of the aligned environment in latex?

For example in the following Latex equation, the plus signs in the second right hand side are vertically aligned.

\begin{align*}
    A &= b \\
    &= c \begin{aligned}[t]
        & + d \\
        & + e + f \\
        & + g + h
    \end{aligned}
\end{align*}

I tried the following in typst, but getting the baseline right in the following code is rather difficult:

$
  A &= b \
    &= c #box(baseline: 100% - 0.75em, $
      &#math.class("binary", [+]) d \
      &#math.class("binary", [+]) e + f \
      &#math.class("binary", [+]) g + h
    $) 
$

[EpicEricEE]

You don't really need the box, you can have multiple alignment points in the equation. If that works for you, you can do something like

#show math.plus: math.class.with("binary") // So you don't need to specifiy it every time

$
  A &= b \
    &= c && + d \
    &    && + e + f \
    &    && + g + h
$

The && is necessary to make it left aligned, as the alignment switches between right and left after every & symbol.

[qres]

Thank you for the suggestion! Unfortunately, it seems like I reduced my problem a bit too much. When the first right hand side is longer than $c$, this leads to additional space between $c$ and $+$:

#show math.plus: math.class.with("binary")

$
  A &= sin(b) \
    &= c && + d \
    &    && + e + f \
    &    && + g + h
$

[EpicEricEE]

In case you're still interested, maybe this is a better solution:

#show math.plus: math.class.with("binary")

$
  A & = sin(b) \
    & #block[$
      = c &+ d \
          &+ e + f \
          &+ g + h
    $]
$

If you have numbered equations, you need to add this show rule to prevent the inner equation from being numbered:

#show math.equation.where(block: true): it => {
  set math.equation(numbering: none)
  it
}

[qres]

Thank you, this helps a lot! Also the hint about the numbering.