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Simplifying 3(n + 7) = 3 * 13 Reorder the terms: 3(7 + n) = 3 * 13 (7 * 3 + n * 3) = 3 * 13 (21 + 3n) = 3 * 13 Multiply 3 * 13 21 + 3n = 39 Solving 21 + 3n = 39 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -21 + 3n = 39 + -21 Combine like terms: 21 + -21 = 0 0 + 3n = 39 + -21 3n = 39 + -21 Combine like terms: 39 + -21 = 18 3n = 18 Divide each side by '3'. n = 6 Simplifying n = 6
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