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Simplifying -9n + 20 + 11n = 42 Reorder the terms: 20 + -9n + 11n = 42 Combine like terms: -9n + 11n = 2n 20 + 2n = 42 Solving 20 + 2n = 42 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-20' to each side of the equation. 20 + -20 + 2n = 42 + -20 Combine like terms: 20 + -20 = 0 0 + 2n = 42 + -20 2n = 42 + -20 Combine like terms: 42 + -20 = 22 2n = 22 Divide each side by '2'. n = 11 Simplifying n = 11
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