Although you can close these off using
\right. in cases like this I use one of
\Bigg. For these you need to use
These work with all delimiters and there are "proper" left and right variants:
\biggr,\Biggr`. Rightly or wrongly, I tend use the ambidextrous ones.
In your example, I'd write:
0=\big(a+b+c \\ +d+e\big)
No doubt your real example is not quite this simple, but you can pick the appropriate size of these macros to suit your tastes.