Saya dukung rencana itu.

I support that plan.

Breakdown of Saya dukung rencana itu.

• itu: that
• saya: I
• rencana: the plan
• dukung: to support

Questions & Answers about Saya dukung rencana itu.

What is the literal, word‑for‑word meaning of Saya dukung rencana itu?

Literally:

• Saya = I
• dukung = support
• rencana = plan
• itu = that

So the structure is I support plan that, which corresponds to English I support that plan. The word order in Indonesian is different mainly in where itu (that) goes.

Why does the sentence use dukung and not mendukung?

The base verb is dukung; mendukung is the same verb with the meN- prefix.
In everyday Indonesian, especially in speech, the meN- prefix is often dropped after a subject like saya, so both:

• Saya dukung rencana itu.
• Saya mendukung rencana itu.

are grammatically correct. Mendukung sounds a bit more complete/standard; dukung feels a bit more direct and conversational, and is also common in headlines and slogans.

Are Saya dukung rencana itu and Saya mendukung rencana itu exactly the same?

They express the same basic meaning: I support that plan.

Nuance:

• Saya mendukung rencana itu.
  – neutral, a bit more formal/standard; safe for writing, presentations, news, etc.
• – still correct; slightly more colloquial or emphatic in tone, common in conversation and informal writing.