To solve the equation \((x + 16)29 = 7\), we first isolate the term containing \(x\). Here are the steps:
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Divide both sides by 29:
\[ x + 16 = \frac{7}{29} \]
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Next, we subtract 16 from both sides:
\[ x = \frac{7}{29} - 16 \]
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To combine the two terms here (the fraction and the whole number), we convert \(16\) into a fraction with a denominator of \(29\):
\[ 16 = \frac{16 \times 29}{29} = \frac{464}{29} \]
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Now, we can combine the two fractions:
\[ x = \frac{7}{29} - \frac{464}{29} = \frac{7 - 464}{29} = \frac{-457}{29} \]
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Now, we simplify \(\frac{-457}{29}\):
\[ x \approx -15.76 \]
So, the solution to the equation rounded to the nearest hundredth is:
\[ \boxed{-15.76} \]