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Simplifying -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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