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Simplifying 4(2n + -1) + 5 = 21 Reorder the terms: 4(-1 + 2n) + 5 = 21 (-1 * 4 + 2n * 4) + 5 = 21 (-4 + 8n) + 5 = 21 Reorder the terms: -4 + 5 + 8n = 21 Combine like terms: -4 + 5 = 1 1 + 8n = 21 Solving 1 + 8n = 21 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + 8n = 21 + -1 Combine like terms: 1 + -1 = 0 0 + 8n = 21 + -1 8n = 21 + -1 Combine like terms: 21 + -1 = 20 8n = 20 Divide each side by '8'. n = 2.5 Simplifying n = 2.5
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