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Question
Subtract the first term from the second:
`3 1/2"mn",8 1/2"nm"`
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Solution
`8 1/2"nm"-3 1/2"mn"`
= `17/2"nm"-7/2"mn"`
= `(17"nm"-7"mn")/2`
= `(10"mn")/2`
= 5mn
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