الفريقين ممكن يتعادلوا.

It means the two teams.

• فريق = team
• الـ = the
• -ين here marks the dual, so it means two

So الفريقين = the two teams.
If you remove الـ, فريقين would mean two teams.

Because this sentence is in Egyptian Arabic, not formal MSA.

In MSA, a dual subject would usually be الفريقان.
In Egyptian Arabic, the dual is normally used as -ين in everyday speech, so الفريقين is the natural colloquial form.

So:

• الفريقان = more formal / MSA
• الفريقين = normal Egyptian colloquial

That is very normal in Egyptian Arabic.

Even when the subject is two people or things, Egyptian usually uses the plural verb form, not a special dual verb form. So يتعادلوا is the expected colloquial form here.

In other words:

• الفريقين = two teams
• يتعادلوا = they tie / they draw

In formal MSA, you would more likely see a dual verb such as يتعادلا, but in Egyptian يتعادلوا is natural.

ممكن means something like possible, and with a following present-tense verb it often means:

• may
• might
• can
• could

So ممكن يتعادلوا means they might draw or they could end in a tie.

It is a very common Egyptian way to express possibility.

Yes, in this sentence it is being used in a sports context.

يتعادلوا means to draw, to tie, or to end level. It is commonly used for matches, games, and scores.

So if two teams finish with the same score, you can say they اتعادلوا or ممكن يتعادلوا depending on the context.

Because Arabic often does not need an explicit subject pronoun.

The ending -وا on يتعادلوا already tells you that the subject is they. And the noun الفريقين already tells you who those they are.

So a separate pronoun like هما is usually unnecessary unless you want extra emphasis.

Yes. This sentence is natural, but other word orders are also possible.

For example:

• الفريقين ممكن يتعادلوا
• ممكن الفريقين يتعادلوا

Both are understandable and natural in Egyptian. The difference is mostly about focus:

• starting with الفريقين puts the teams first
• starting with ممكن puts the idea of possibility first

A more MSA-style version would be something like:

• الفريقان قد يتعادلان
• يمكن أن يتعادلا

Compared with that, الفريقين ممكن يتعادلوا sounds clearly more Egyptian colloquial because of:

• الفريقين instead of الفريقان
• يتعادلوا instead of the dual يتعادلا

A common Egyptian-style pronunciation would be:

il-farīʔēn momken yitʕādlu

A few useful notes:

• الـ is often pronounced il- or el-
• ق in فريق is usually a glottal stop in Egyptian, so it sounds like farīʔ
• ع in يتعادلوا is the Arabic sound ʕ, which does not really exist in English

So the sentence does not sound like a careful MSA pronunciation. It sounds Egyptian.