Not all countries use a comma $(,)$ to separate thousands, millions, etc. when writing numbers like we do here in the United States. For example, in the U$.$S$.,$ the number seven thousand is written $7,000.$ How woyld this number commonly be written in countries that do not use the comma?

$7\mathrm{.}000$

$7$

$\frac{7}{000}$

$7$&$000$

$7+000$