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Simplifying 3n + -21 = n + 9 Reorder the terms: -21 + 3n = n + 9 Reorder the terms: -21 + 3n = 9 + n Solving -21 + 3n = 9 + 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. -21 + 3n + -1n = 9 + n + -1n Combine like terms: 3n + -1n = 2n -21 + 2n = 9 + n + -1n Combine like terms: n + -1n = 0 -21 + 2n = 9 + 0 -21 + 2n = 9 Add '21' to each side of the equation. -21 + 21 + 2n = 9 + 21 Combine like terms: -21 + 21 = 0 0 + 2n = 9 + 21 2n = 9 + 21 Combine like terms: 9 + 21 = 30 2n = 30 Divide each side by '2'. n = 15 Simplifying n = 15
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