Answer
$y^{4}$
Work Step by Step
Based on the power of a quotient rule, we know that $\frac{a^{m}}{{a}^{n}}=a^{m-n}, a\ne0$ (where $m$ and $n$ are positive integers and $a$ is a real number).
Therefore, $\frac{y^{7}}{{y}^{3}}=y^{7-3}=y^{4}$.
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