Newline @"\\" and @\longrightarrow breaks

```
Stringbuilder postupak; double mean, sumaFi;
//few lines of code
postupak.Append(mean);
postupak.Append(@"\\ "); //it breaks here, without it works correctly
postupak.Append(@"Q_{1} = \frac{\sum_{i}^N f_{i}}{4} = \frac{");
postupak.Append(sumaFi);
postupak.Append(@"}{4} = ");
postupak.Append(sumaFi / 4);
postupak.Append(@" \longrightarrow Q_{1} = "); //it breaks here, without it works correctly
```

Am i using commands wrong or is it a bug ?