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Simplifying 10n + 9 = 99 Reorder the terms: 9 + 10n = 99 Solving 9 + 10n = 99 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + 10n = 99 + -9 Combine like terms: 9 + -9 = 0 0 + 10n = 99 + -9 10n = 99 + -9 Combine like terms: 99 + -9 = 90 10n = 90 Divide each side by '10'. n = 9 Simplifying n = 9
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