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i dont think this is correct but solve for x, i will draw out my problem and work.

Mathematics
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What is the original problem? \(-4\sqrt{x+9}=20\)?
yes

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Okay. You can't add 4, because it's \(-4\sqrt{x+9}\), not \(-4+\sqrt{x+9}\). You can divide, though, which will give you \(\sqrt{x+9}=-5\), then square both sides to get \(x+9=25\), so \(x=16\).
ahh i see. thank you.

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