merging different otu tables for analysis

Good day, i am back again, i have three (3) different otu tables in .txt files that i need to import and merge them into one otu for analysis, each otu table has different sample names that i want collapse OTUs with identical taxonomy. I was in this forum that i need to separate taxonomy information in a separate file from OTU table before importing and coverting to .biom file. how can i merge this otu tables with different sample Id. attached are the examples of my otu tables
Thank you for your help.

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