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Simplifying 21 = 2n + 8n Combine like terms: 2n + 8n = 10n 21 = 10n Solving 21 = 10n Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-10n' to each side of the equation. 21 + -10n = 10n + -10n Combine like terms: 10n + -10n = 0 21 + -10n = 0 Add '-21' to each side of the equation. 21 + -21 + -10n = 0 + -21 Combine like terms: 21 + -21 = 0 0 + -10n = 0 + -21 -10n = 0 + -21 Combine like terms: 0 + -21 = -21 -10n = -21 Divide each side by '-10'. n = 2.1 Simplifying n = 2.1
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