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Simplifying 21 + 3n = 0.8n + 18 Reorder the terms: 21 + 3n = 18 + 0.8n Solving 21 + 3n = 18 + 0.8n Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-0.8n' to each side of the equation. 21 + 3n + -0.8n = 18 + 0.8n + -0.8n Combine like terms: 3n + -0.8n = 2.2n 21 + 2.2n = 18 + 0.8n + -0.8n Combine like terms: 0.8n + -0.8n = 0.0 21 + 2.2n = 18 + 0.0 21 + 2.2n = 18 Add '-21' to each side of the equation. 21 + -21 + 2.2n = 18 + -21 Combine like terms: 21 + -21 = 0 0 + 2.2n = 18 + -21 2.2n = 18 + -21 Combine like terms: 18 + -21 = -3 2.2n = -3 Divide each side by '2.2'. n = -1.363636364 Simplifying n = -1.363636364
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