To solve the equation \( 13 - 2n = -109 \), follow these steps:
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Subtract 13 from both sides of the equation: \[ 13 - 2n - 13 = -109 - 13 \] This simplifies to: \[ -2n = -122 \]
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Now, divide both sides by -2: \[ n = \frac{-122}{-2} = 61 \]
So, the value for \( n \) that makes the equation true is 61.