To solve the equation \(-20 = -5 + 3x\), follow these steps:
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Start by isolating the term with \(x\). Add \(5\) to both sides of the equation:
\[ -20 + 5 = 3x \]
This simplifies to:
\[ -15 = 3x \]
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Next, divide both sides by \(3\):
\[ \frac{-15}{3} = x \]
This gives:
\[ x = -5 \]
Therefore, the solution is:
\[ \boxed{-5} \]