Both read grammatically fine to me. If you prefer to do things in 4 lines rather than one, and repeat the variable, that's up to you I guess - a lot of people s

Both read grammatically fine to me. If you prefer to do things in 4 lines rather than one, and repeat the variable, that's up to you I guess - a lot of people seem to agree - but honestly I don't get what the fuss is about.