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Simplifying 10n = 9n + 21 Reorder the terms: 10n = 21 + 9n Solving 10n = 21 + 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. 10n + -9n = 21 + 9n + -9n Combine like terms: 10n + -9n = 1n 1n = 21 + 9n + -9n Combine like terms: 9n + -9n = 0 1n = 21 + 0 1n = 21 Divide each side by '1'. n = 21 Simplifying n = 21
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