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sed

 s/$/;9876543210;9876543210@9876543210/
 s/\([0-9]\)+\([0-9]\);.*\1\(.*\);.*\2\(.*\)@/\3\4/
 s/.\{9\}\(.\).*/\1/

こっちも同じ

 2+6;9876543210;9876543210@9876543210