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Simplifying 21 = 5n + -8n Combine like terms: 5n + -8n = -3n 21 = -3n Solving 21 = -3n Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '3n' to each side of the equation. 21 + 3n = -3n + 3n Combine like terms: -3n + 3n = 0 21 + 3n = 0 Add '-21' to each side of the equation. 21 + -21 + 3n = 0 + -21 Combine like terms: 21 + -21 = 0 0 + 3n = 0 + -21 3n = 0 + -21 Combine like terms: 0 + -21 = -21 3n = -21 Divide each side by '3'. n = -7 Simplifying n = -7
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