This simplified ............. to the decision-making process is a must read for anyone ............... important real estate, personal, or professional decisions.
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"Guide" is often used to refer to resources that help individuals navigate complex decisions. "Facing" is the appropriate term for someone dealing with challenges or situations.
The sentence refers to a simplified explanation or resource on decision-making, which fits "guide." The phrase "facing important decisions" is the correct way to convey dealing with or encountering such situations. Therefore, Option (4) is the right choice.
\[
\boxed{4}
\]