Kapitał własny in inglese:

If there is to be any equity in the world, we have to enforce it ourselves.

The company's equity rose by $39 million.

equity capital

Members’ shares are equity if the entity has an unconditional right to refuse redemption of the members’ shares

In this meaning, equity is always singular and usually followed by an in phrase

She decided to sell her equity in the company.

The issue is important not just as a matter of equity.

You need to have an equity to start a new business

Rising home prices mean the couple’s equity in their home is rising, too.

There is but one law for all, namely, that law which governs all law, the law of our Creator, the law of humanity, justice, equity — the law of nature, and of nations.