For the coefficients, we have 7 and 4, so 7 times 4 gives us 28. For the variables, we have $x^{3}$ and $x$, and $y^{-5}$ and $y^{3}$. Since the bases are the same and they are being multiplied, we add the exponents. So, $x^{3} * x^{1}$ gives us $x^{4}$ and
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