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Equivalent expressions with common denominators

Problem

At a science museum, Julia compares the length of a T-rex tooth and a crocodile tooth. The T-rex tooth is start color #11accd, start fraction, 7, divided by, 12, end fraction, end color #11accd foot long. The crocodile tooth is start color #1fab54, start fraction, 1, divided by, 4, end fraction, end color #1fab54 foot long.
What expression can be used to find how much longer the T-rex tooth is than the crocodile tooth?
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