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Simplifying -20 + 5 = 4(1 + 2n) Combine like terms: -20 + 5 = -15 -15 = 4(1 + 2n) -15 = (1 * 4 + 2n * 4) -15 = (4 + 8n) Solving -15 = 4 + 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. -15 + -8n = 4 + 8n + -8n Combine like terms: 8n + -8n = 0 -15 + -8n = 4 + 0 -15 + -8n = 4 Add '15' to each side of the equation. -15 + 15 + -8n = 4 + 15 Combine like terms: -15 + 15 = 0 0 + -8n = 4 + 15 -8n = 4 + 15 Combine like terms: 4 + 15 = 19 -8n = 19 Divide each side by '-8'. n = -2.375 Simplifying n = -2.375
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