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Simplifying n + 21 = 0 Reorder the terms: 21 + n = 0 Solving 21 + n = 0 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -21 + n = 0 + -21 Combine like terms: 21 + -21 = 0 0 + n = 0 + -21 n = 0 + -21 Combine like terms: 0 + -21 = -21 n = -21 Simplifying n = -21
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