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Simplifying 9 + 9n + -90 = 0 Reorder the terms: 9 + -90 + 9n = 0 Combine like terms: 9 + -90 = -81 -81 + 9n = 0 Solving -81 + 9n = 0 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '81' to each side of the equation. -81 + 81 + 9n = 0 + 81 Combine like terms: -81 + 81 = 0 0 + 9n = 0 + 81 9n = 0 + 81 Combine like terms: 0 + 81 = 81 9n = 81 Divide each side by '9'. n = 9 Simplifying n = 9
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