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Simplifying 9 + 3n = 30 + n Solving 9 + 3n = 30 + n Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-1n' to each side of the equation. 9 + 3n + -1n = 30 + n + -1n Combine like terms: 3n + -1n = 2n 9 + 2n = 30 + n + -1n Combine like terms: n + -1n = 0 9 + 2n = 30 + 0 9 + 2n = 30 Add '-9' to each side of the equation. 9 + -9 + 2n = 30 + -9 Combine like terms: 9 + -9 = 0 0 + 2n = 30 + -9 2n = 30 + -9 Combine like terms: 30 + -9 = 21 2n = 21 Divide each side by '2'. n = 10.5 Simplifying n = 10.5
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