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Simplifying 6n + 15 = 3n + 21 Reorder the terms: 15 + 6n = 3n + 21 Reorder the terms: 15 + 6n = 21 + 3n Solving 15 + 6n = 21 + 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. 15 + 6n + -3n = 21 + 3n + -3n Combine like terms: 6n + -3n = 3n 15 + 3n = 21 + 3n + -3n Combine like terms: 3n + -3n = 0 15 + 3n = 21 + 0 15 + 3n = 21 Add '-15' to each side of the equation. 15 + -15 + 3n = 21 + -15 Combine like terms: 15 + -15 = 0 0 + 3n = 21 + -15 3n = 21 + -15 Combine like terms: 21 + -15 = 6 3n = 6 Divide each side by '3'. n = 2 Simplifying n = 2
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