$$\sqrt { 2025 } + \sqrt { 0.0612 + x } = 45.25 , x$$
$x=0.0013$
$$\sqrt{x+0.0612}+\sqrt{2025}-\sqrt{2025}=45.25-\sqrt{2025}$$
$$\sqrt{x+0.0612}=45.25-\sqrt{2025}$$
$$\sqrt{x+0.0612}=0.25$$
$$x+0.0612=0.0625$$
$$x+0.0612-0.0612=0.0625-0.0612$$
$$x=0.0625-0.0612$$
$$x=0.0013$$
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