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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 = 12n -15 + 12n = 21 + -3n + 3n Combine like terms: -3n + 3n = 0 -15 + 12n = 21 + 0 -15 + 12n = 21 Add '15' to each side of the equation. -15 + 15 + 12n = 21 + 15 Combine like terms: -15 + 15 = 0 0 + 12n = 21 + 15 12n = 21 + 15 Combine like terms: 21 + 15 = 36 12n = 36 Divide each side by '12'. n = 3 Simplifying n = 3
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