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Simplifying 7(n + 4) = 21 + 28 Reorder the terms: 7(4 + n) = 21 + 28 (4 * 7 + n * 7) = 21 + 28 (28 + 7n) = 21 + 28 Combine like terms: 21 + 28 = 49 28 + 7n = 49 Solving 28 + 7n = 49 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-28' to each side of the equation. 28 + -28 + 7n = 49 + -28 Combine like terms: 28 + -28 = 0 0 + 7n = 49 + -28 7n = 49 + -28 Combine like terms: 49 + -28 = 21 7n = 21 Divide each side by '7'. n = 3 Simplifying n = 3
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