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Simplifying 9 = 4n + -1(8n + 1) Reorder the terms: 9 = 4n + -1(1 + 8n) 9 = 4n + (1 * -1 + 8n * -1) 9 = 4n + (-1 + -8n) Reorder the terms: 9 = -1 + 4n + -8n Combine like terms: 4n + -8n = -4n 9 = -1 + -4n Solving 9 = -1 + -4n Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '4n' to each side of the equation. 9 + 4n = -1 + -4n + 4n Combine like terms: -4n + 4n = 0 9 + 4n = -1 + 0 9 + 4n = -1 Add '-9' to each side of the equation. 9 + -9 + 4n = -1 + -9 Combine like terms: 9 + -9 = 0 0 + 4n = -1 + -9 4n = -1 + -9 Combine like terms: -1 + -9 = -10 4n = -10 Divide each side by '4'. n = -2.5 Simplifying n = -2.5

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