Follow-up Comment #2, bug #68831 (group groff): I'm assuming familiarity with the recap in bug #68830. Eqn can be affected by the mode it is in before the eqn. Try this:-
\Z@\D't 24000'@
.\" \Z@\D't -1'@
.ps 24
.EQ
x = { -b +- sqrt {b sup 2 -4ac}} over {2a}
.EN
Unless your running a very recent groff (with commit #744d3a8 - 3rd Sept)
stick to -Tps, before this fix -Tpdf behaved differently, now the same.
This is an example of mode 2 before the eqn. If you uncomment the second line
it goes back to node 1 and everything is normal. The perceived width of a line
can be difficult to judge with the eye since it depends on many things, dpi of
screen, whether the viewer supports graphics anti-aliasing, etc..
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