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Simplifying 20n + -19n + 21 = -21 Reorder the terms: 21 + 20n + -19n = -21 Combine like terms: 20n + -19n = 1n 21 + 1n = -21 Solving 21 + 1n = -21 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 + 1n = -21 + -21 Combine like terms: 21 + -21 = 0 0 + 1n = -21 + -21 1n = -21 + -21 Combine like terms: -21 + -21 = -42 1n = -42 Divide each side by '1'. n = -42 Simplifying n = -42
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