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Simplifying -135 = -9(n + 9) Reorder the terms: -135 = -9(9 + n) -135 = (9 * -9 + n * -9) -135 = (-81 + -9n) Solving -135 = -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. -135 + 9n = -81 + -9n + 9n Combine like terms: -9n + 9n = 0 -135 + 9n = -81 + 0 -135 + 9n = -81 Add '135' to each side of the equation. -135 + 135 + 9n = -81 + 135 Combine like terms: -135 + 135 = 0 0 + 9n = -81 + 135 9n = -81 + 135 Combine like terms: -81 + 135 = 54 9n = 54 Divide each side by '9'. n = 6 Simplifying n = 6
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