Example exc-124

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x x xx0

<math>
<apply><forall/><bvar><ci>x</ci></bvar>
<condition><apply><in/><ci>x</ci><reals/></apply></condition>
<apply><eq/><apply><minus/><ci>x</ci><ci>x</ci></apply><cn>0</cn></apply>
</apply>
</math>