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Simplifying 5n + 7 + -4 = 3(n + 7) Reorder the terms: 7 + -4 + 5n = 3(n + 7) Combine like terms: 7 + -4 = 3 3 + 5n = 3(n + 7) Reorder the terms: 3 + 5n = 3(7 + n) 3 + 5n = (7 * 3 + n * 3) 3 + 5n = (21 + 3n) Solving 3 + 5n = 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. 3 + 5n + -3n = 21 + 3n + -3n Combine like terms: 5n + -3n = 2n 3 + 2n = 21 + 3n + -3n Combine like terms: 3n + -3n = 0 3 + 2n = 21 + 0 3 + 2n = 21 Add '-3' to each side of the equation. 3 + -3 + 2n = 21 + -3 Combine like terms: 3 + -3 = 0 0 + 2n = 21 + -3 2n = 21 + -3 Combine like terms: 21 + -3 = 18 2n = 18 Divide each side by '2'. n = 9 Simplifying n = 9
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