Q: Can I use an equation from another article in my own?

Detailed Question -

Hello, I need to write an article to publish. I don't have any experience with statistics and econometrical models.
I would like to know if I can use another author's formula/equation for my article. The topic is more or less the same, however, the country and data change completely. I would, of course, cite the author and say that the formula is taken from him.
I would also like to know if the journals would accept an article without an original equation.

No answer yet