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Simplifying -21 = 3n + -8n Combine like terms: 3n + -8n = -5n -21 = -5n Solving -21 = -5n Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '5n' to each side of the equation. -21 + 5n = -5n + 5n Combine like terms: -5n + 5n = 0 -21 + 5n = 0 Add '21' to each side of the equation. -21 + 21 + 5n = 0 + 21 Combine like terms: -21 + 21 = 0 0 + 5n = 0 + 21 5n = 0 + 21 Combine like terms: 0 + 21 = 21 5n = 21 Divide each side by '5'. n = 4.2 Simplifying n = 4.2
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