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Simplifying 4(n + 3) + 7n = 21 Reorder the terms: 4(3 + n) + 7n = 21 (3 * 4 + n * 4) + 7n = 21 (12 + 4n) + 7n = 21 Combine like terms: 4n + 7n = 11n 12 + 11n = 21 Solving 12 + 11n = 21 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-12' to each side of the equation. 12 + -12 + 11n = 21 + -12 Combine like terms: 12 + -12 = 0 0 + 11n = 21 + -12 11n = 21 + -12 Combine like terms: 21 + -12 = 9 11n = 9 Divide each side by '11'. n = 0.8181818182 Simplifying n = 0.8181818182
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