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Simplifying 9n + 20 = -9n + -21 Reorder the terms: 20 + 9n = -9n + -21 Reorder the terms: 20 + 9n = -21 + -9n Solving 20 + 9n = -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. 20 + 9n + 9n = -21 + -9n + 9n Combine like terms: 9n + 9n = 18n 20 + 18n = -21 + -9n + 9n Combine like terms: -9n + 9n = 0 20 + 18n = -21 + 0 20 + 18n = -21 Add '-20' to each side of the equation. 20 + -20 + 18n = -21 + -20 Combine like terms: 20 + -20 = 0 0 + 18n = -21 + -20 18n = -21 + -20 Combine like terms: -21 + -20 = -41 18n = -41 Divide each side by '18'. n = -2.277777778 Simplifying n = -2.277777778
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