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Simplifying 21 = 3(n + 6) Reorder the terms: 21 = 3(6 + n) 21 = (6 * 3 + n * 3) 21 = (18 + 3n) Solving 21 = 18 + 3n Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-3n' to each side of the equation. 21 + -3n = 18 + 3n + -3n Combine like terms: 3n + -3n = 0 21 + -3n = 18 + 0 21 + -3n = 18 Add '-21' to each side of the equation. 21 + -21 + -3n = 18 + -21 Combine like terms: 21 + -21 = 0 0 + -3n = 18 + -21 -3n = 18 + -21 Combine like terms: 18 + -21 = -3 -3n = -3 Divide each side by '-3'. n = 1 Simplifying n = 1
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