To solve the equation \( \frac{n}{5} + 10 = -20 \), follow these steps:
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Subtract 10 from both sides of the equation:
\[ \frac{n}{5} + 10 - 10 = -20 - 10 \]
This simplifies to:
\[ \frac{n}{5} = -30 \]
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Now, multiply both sides by 5 to isolate \( n \):
\[ n = -30 \times 5 \]
Which simplifies to:
\[ n = -150 \]
Thus, the solution is \( n = -150 \).
The correct answer is -150.