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Simplifying 21 = n + -3 + 7n Reorder the terms: 21 = -3 + n + 7n Combine like terms: n + 7n = 8n 21 = -3 + 8n Solving 21 = -3 + 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 = -3 + 8n + -8n Combine like terms: 8n + -8n = 0 21 + -8n = -3 + 0 21 + -8n = -3 Add '-21' to each side of the equation. 21 + -21 + -8n = -3 + -21 Combine like terms: 21 + -21 = 0 0 + -8n = -3 + -21 -8n = -3 + -21 Combine like terms: -3 + -21 = -24 -8n = -24 Divide each side by '-8'. n = 3 Simplifying n = 3
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