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Simplifying 3n + 18 = 39 + -4n Reorder the terms: 18 + 3n = 39 + -4n Solving 18 + 3n = 39 + -4n Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '4n' to each side of the equation. 18 + 3n + 4n = 39 + -4n + 4n Combine like terms: 3n + 4n = 7n 18 + 7n = 39 + -4n + 4n Combine like terms: -4n + 4n = 0 18 + 7n = 39 + 0 18 + 7n = 39 Add '-18' to each side of the equation. 18 + -18 + 7n = 39 + -18 Combine like terms: 18 + -18 = 0 0 + 7n = 39 + -18 7n = 39 + -18 Combine like terms: 39 + -18 = 21 7n = 21 Divide each side by '7'. n = 3 Simplifying n = 3
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