9. Express 21/ 3/5 + 13
With rational denominator.
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ɴᴏʀᴛʜ ᴘᴏʟᴇ ᴛᴏ sᴏᴜᴛʜ ᴘᴏʟᴇ ɪs ᴛʜᴇ ᴅɪʀᴇᴄᴛɪᴏɴ ᴏғ ᴍᴀɢɴᴇᴛɪᴄ ғɪᴇʟᴅ ʟɪɴᴇs ᴏᴜᴛsɪᴅᴇ ᴀ ʙᴀʀ-ᴍᴀɢɴᴇᴛ. ᴛʜᴇ ᴍᴀɢɴᴇᴛɪᴄ ғɪᴇʟᴅ ɪs ᴛʜᴇ sᴛʀᴏɴɢᴇsᴛ ɪɴsɪᴅᴇ ᴛʜᴇ ᴍᴀɢɴᴇᴛɪᴄ ᴍᴀᴛᴇʀɪᴀʟ. ᴛʜᴇ sᴛʀᴏɴɢᴇsᴛ ᴇxᴛᴇʀɴᴀʟ ᴍᴀɢɴᴇᴛɪᴄ ғɪᴇʟᴅs ᴀʀᴇ ɴᴇᴀʀ ᴛʜᴇ ᴘᴏʟᴇs. ᴀ ᴍᴀɢɴᴇᴛɪᴄ ɴᴏʀᴛʜ ᴘᴏʟᴇ ᴡɪʟʟ ᴀᴛᴛʀᴀᴄᴛ ᴛʜᴇ sᴏᴜᴛʜ ᴘᴏʟᴇ ᴏғ ᴀɴᴏᴛʜᴇʀ ᴍᴀɢɴᴇᴛ, ᴀɴᴅ ʀᴇᴘᴇʟ ᴀ ɴᴏʀᴛʜ ᴘᴏʟᴇ.
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