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Simplifying 2n + 9 = 30 + -1n Reorder the terms: 9 + 2n = 30 + -1n Solving 9 + 2n = 30 + -1n Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add 'n' to each side of the equation. 9 + 2n + n = 30 + -1n + n Combine like terms: 2n + n = 3n 9 + 3n = 30 + -1n + n Combine like terms: -1n + n = 0 9 + 3n = 30 + 0 9 + 3n = 30 Add '-9' to each side of the equation. 9 + -9 + 3n = 30 + -9 Combine like terms: 9 + -9 = 0 0 + 3n = 30 + -9 3n = 30 + -9 Combine like terms: 30 + -9 = 21 3n = 21 Divide each side by '3'. n = 7 Simplifying n = 7
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