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Simplifying -9 = -9(n + 9) Reorder the terms: -9 = -9(9 + n) -9 = (9 * -9 + n * -9) -9 = (-81 + -9n) Solving -9 = -81 + -9n Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '9n' to each side of the equation. -9 + 9n = -81 + -9n + 9n Combine like terms: -9n + 9n = 0 -9 + 9n = -81 + 0 -9 + 9n = -81 Add '9' to each side of the equation. -9 + 9 + 9n = -81 + 9 Combine like terms: -9 + 9 = 0 0 + 9n = -81 + 9 9n = -81 + 9 Combine like terms: -81 + 9 = -72 9n = -72 Divide each side by '9'. n = -8 Simplifying n = -8
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