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Simplifying 15 = 4.5n + -21(n + -4) Reorder the terms: 15 = 4.5n + -21(-4 + n) 15 = 4.5n + (-4 * -21 + n * -21) 15 = 4.5n + (84 + -21n) Reorder the terms: 15 = 84 + 4.5n + -21n Combine like terms: 4.5n + -21n = -16.5n 15 = 84 + -16.5n Solving 15 = 84 + -16.5n Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '16.5n' to each side of the equation. 15 + 16.5n = 84 + -16.5n + 16.5n Combine like terms: -16.5n + 16.5n = 0.0 15 + 16.5n = 84 + 0.0 15 + 16.5n = 84 Add '-15' to each side of the equation. 15 + -15 + 16.5n = 84 + -15 Combine like terms: 15 + -15 = 0 0 + 16.5n = 84 + -15 16.5n = 84 + -15 Combine like terms: 84 + -15 = 69 16.5n = 69 Divide each side by '16.5'. n = 4.181818182 Simplifying n = 4.181818182
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