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Simplifying 9n + 15 = 3n + -21 Reorder the terms: 15 + 9n = 3n + -21 Reorder the terms: 15 + 9n = -21 + 3n Solving 15 + 9n = -21 + 3n Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-3n' to each side of the equation. 15 + 9n + -3n = -21 + 3n + -3n Combine like terms: 9n + -3n = 6n 15 + 6n = -21 + 3n + -3n Combine like terms: 3n + -3n = 0 15 + 6n = -21 + 0 15 + 6n = -21 Add '-15' to each side of the equation. 15 + -15 + 6n = -21 + -15 Combine like terms: 15 + -15 = 0 0 + 6n = -21 + -15 6n = -21 + -15 Combine like terms: -21 + -15 = -36 6n = -36 Divide each side by '6'. n = -6 Simplifying n = -6
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