If ‘+’ means ‘-’, ‘-’ means ‘×’, ‘×’ means ‘÷’ and ‘÷’ means ‘+’, then which equation is correct?

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1. Replace operators: **+ → −**, **− → ×**, **× → ÷**, **÷ → +**.

2. Check option (d): original left is `18 ÷ 6 + 3`.

3. After replacement `÷ → +` and `+ → −`, left becomes $18+6-3$.

4. Compute: $18+6=24$, then $24-3=21$. This equals the RHS.

FINAL_ANSWER: d

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