Which equation below is a literal equation?

Nine point nine plus one point one equals ten plus one

One third plus two equals two and one third

Four minus eighteen equals negative fourteen

h plus twelve minus seven equals eight minus twenty-seven

Question

Which equation below is a literal equation?

Nine point nine plus one point one equals ten plus one

One third plus two equals two and one third

Four minus eighteen equals negative fourteen

h plus twelve minus seven equals eight minus twenty-seven

anonymous · Answer

i am going to guess it is the last one, because it has an $h$ in it, whereas the other 3 are numbers

skullpatrol · Answer

@TTP  do you have any ideas?