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Simplifying 3n + -9 = -21 + 9n Reorder the terms: -9 + 3n = -21 + 9n Solving -9 + 3n = -21 + 9n Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-9n' to each side of the equation. -9 + 3n + -9n = -21 + 9n + -9n Combine like terms: 3n + -9n = -6n -9 + -6n = -21 + 9n + -9n Combine like terms: 9n + -9n = 0 -9 + -6n = -21 + 0 -9 + -6n = -21 Add '9' to each side of the equation. -9 + 9 + -6n = -21 + 9 Combine like terms: -9 + 9 = 0 0 + -6n = -21 + 9 -6n = -21 + 9 Combine like terms: -21 + 9 = -12 -6n = -12 Divide each side by '-6'. n = 2 Simplifying n = 2
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