[Groff] Multiple Lines Equation

[Caleb Foong]

Hi,

I want my equations to be in multiple lines like this:

z = x + y 
c = a + b

But this doesn't work:

.EQ
z = x+y
.br       #.sp also doesn't work
c = a+b
.EQ

So instead of writing:
.EQ
x = x+y
.EN
.EQ
c = a+b
.EN

Is there any other way?

-
Caleb