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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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