To solve the equation \(-20 = -5 + 3x\), follow these steps:
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Add \(5\) to both sides to isolate the term with \(x\): \[ -20 + 5 = 3x \] This simplifies to: \[ -15 = 3x \]
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Now, divide both sides by \(3\) to solve for \(x\): \[ x = \frac{-15}{3} \] Simplifying this gives: \[ x = -5 \]
So, the solution is: \[ \boxed{-5} \]