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Divide the monomials and simplify.
$- \frac{9 z^{7} x^{4}}{7 z^{4}}$
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Answer

$- \frac{9}{7} \cdot \frac{z^{7}}{z^{4}} \cdot x^{4} = - \frac{9}{7} \cdot z^{3} \cdot x^{4}$

Steps

Step 1 ： $- \frac{9 z^{7} x^{4}}{7 z^{4}} = - \frac{9}{7} \cdot \frac{z^{7}}{z^{4}} \cdot x^{4}$

Step 2 ： $\frac{z^{7}}{z^{4}} = z^{(7 - 4)} = z^{3}$

Step 3 ： $- \frac{9}{7} \cdot \frac{z^{7}}{z^{4}} \cdot x^{4} = - \frac{9}{7} \cdot z^{3} \cdot x^{4}$