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Simplifying 399 = 7(7n + 1) Reorder the terms: 399 = 7(1 + 7n) 399 = (1 * 7 + 7n * 7) 399 = (7 + 49n) Solving 399 = 7 + 49n Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-49n' to each side of the equation. 399 + -49n = 7 + 49n + -49n Combine like terms: 49n + -49n = 0 399 + -49n = 7 + 0 399 + -49n = 7 Add '-399' to each side of the equation. 399 + -399 + -49n = 7 + -399 Combine like terms: 399 + -399 = 0 0 + -49n = 7 + -399 -49n = 7 + -399 Combine like terms: 7 + -399 = -392 -49n = -392 Divide each side by '-49'. n = 8 Simplifying n = 8
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