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Simplifying 9n + 21 = 8n + 7 Reorder the terms: 21 + 9n = 8n + 7 Reorder the terms: 21 + 9n = 7 + 8n Solving 21 + 9n = 7 + 8n Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-8n' to each side of the equation. 21 + 9n + -8n = 7 + 8n + -8n Combine like terms: 9n + -8n = 1n 21 + 1n = 7 + 8n + -8n Combine like terms: 8n + -8n = 0 21 + 1n = 7 + 0 21 + 1n = 7 Add '-21' to each side of the equation. 21 + -21 + 1n = 7 + -21 Combine like terms: 21 + -21 = 0 0 + 1n = 7 + -21 1n = 7 + -21 Combine like terms: 7 + -21 = -14 1n = -14 Divide each side by '1'. n = -14 Simplifying n = -14
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