Variables $$\(x\)$$ and $$\(y\)$$ are related by the equation $$\(y=x \sqrt{1+2 x}\)$$. It is given that when $$\(y=12, x=4\)$$. Find the approximate change in $$\(x\)$$ when $$\(y\)$$ increases from 12 by the small amount 0.06 .

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