$$\sqrt{2025}+\sqrt{0.0612+x}=45.24$$
$x=-0.0036$
$$\sqrt{x+0.0612}+\sqrt{2025}-\sqrt{2025}=45.24-\sqrt{2025}$$
$$\sqrt{x+0.0612}=45.24-\sqrt{2025}$$
$$\sqrt{x+0.0612}=0.24$$
$$x+0.0612=0.0576$$
$$x+0.0612-0.0612=0.0576-0.0612$$
$$x=0.0576-0.0612$$
$$x=-0.0036$$
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