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Simplifying 9n + -18 = -21 + 8n Reorder the terms: -18 + 9n = -21 + 8n Solving -18 + 9n = -21 + 8n Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-8n' to each side of the equation. -18 + 9n + -8n = -21 + 8n + -8n Combine like terms: 9n + -8n = 1n -18 + 1n = -21 + 8n + -8n Combine like terms: 8n + -8n = 0 -18 + 1n = -21 + 0 -18 + 1n = -21 Add '18' to each side of the equation. -18 + 18 + 1n = -21 + 18 Combine like terms: -18 + 18 = 0 0 + 1n = -21 + 18 1n = -21 + 18 Combine like terms: -21 + 18 = -3 1n = -3 Divide each side by '1'. n = -3 Simplifying n = -3
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