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Simplifying 21 = 1 + 8n + 4 Reorder the terms: 21 = 1 + 4 + 8n Combine like terms: 1 + 4 = 5 21 = 5 + 8n Solving 21 = 5 + 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 + -8n = 5 + 8n + -8n Combine like terms: 8n + -8n = 0 21 + -8n = 5 + 0 21 + -8n = 5 Add '-21' to each side of the equation. 21 + -21 + -8n = 5 + -21 Combine like terms: 21 + -21 = 0 0 + -8n = 5 + -21 -8n = 5 + -21 Combine like terms: 5 + -21 = -16 -8n = -16 Divide each side by '-8'. n = 2 Simplifying n = 2
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