Question: How to refer to non-executable Math in a document

Hello everyone,

I have a question about adding references to a non executable math in a document. Namely, If we use an executable math there is a label that appears on the right of a formula. We can use it as a reference. However, there is no label when we use non-executable math. I wonder how can I refer to that, the point is to create a document with a references to formulas.

To illustrate the point I would like to create a text like the following :

...

X=2 (equation 1)

X=3 (equation 2)

.....Some text here......

From the (equation 2) we can achieve that ....

Regards

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