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Simplifying 7(n + 3) + 3n = 21 Reorder the terms: 7(3 + n) + 3n = 21 (3 * 7 + n * 7) + 3n = 21 (21 + 7n) + 3n = 21 Combine like terms: 7n + 3n = 10n 21 + 10n = 21 Add '-21' to each side of the equation. 21 + -21 + 10n = 21 + -21 Combine like terms: 21 + -21 = 0 0 + 10n = 21 + -21 10n = 21 + -21 Combine like terms: 21 + -21 = 0 10n = 0 Solving 10n = 0 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Divide each side by '10'. n = 0.0 Simplifying n = 0.0
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