$$=\frac{2\times15\times10^{2}\times(-1)^{2024}}{5^{2}\times z^{2}}$$
$\frac{120}{z^{2}}$
$$\frac{30\times 10^{2}\left(-1\right)^{2024}}{5^{2}z^{2}}$$
$$\frac{30\times 100\left(-1\right)^{2024}}{5^{2}z^{2}}$$
$$\frac{3000\left(-1\right)^{2024}}{5^{2}z^{2}}$$
$$\frac{3000\times 1}{5^{2}z^{2}}$$
$$\frac{3000}{5^{2}z^{2}}$$
$$\frac{3000}{25z^{2}}$$
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$-\frac{240}{z^{3}}$
