The phrase "subtracts from" can be replaced with several synonyms that convey the same meaning in different ways. For example, words like diminishes, detracts, saps, or erodes all carry the notion of reducing something. On the other hand, expressions like lessens the impact, takes away from, reduces the value of, or undermines would connote a slightly different meaning. They would suggest that something is not only reduced but also affected negatively in another aspect, such as its quality, significance, charm, or credibility. The choice of synonym depends on the context and purpose of the communication. Using synonyms not only enriches the vocabulary but also enhances the precision and impact of the message.