To find the solution to the equation \(-2x + 10 = -30\), we need to solve for \(x\).
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Start with the original equation: \[ -2x + 10 = -30 \]
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Subtract 10 from both sides: \[ -2x = -30 - 10 \] \[ -2x = -40 \]
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Divide both sides by -2: \[ x = \frac{-40}{-2} \] \[ x = 20 \]
The solution to the equation is \(x = 20\).
So, the correct answer is D: 20.