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Simplifying 12 + 3n = 9n Solving 12 + 3n = 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. 12 + 3n + -9n = 9n + -9n Combine like terms: 3n + -9n = -6n 12 + -6n = 9n + -9n Combine like terms: 9n + -9n = 0 12 + -6n = 0 Add '-12' to each side of the equation. 12 + -12 + -6n = 0 + -12 Combine like terms: 12 + -12 = 0 0 + -6n = 0 + -12 -6n = 0 + -12 Combine like terms: 0 + -12 = -12 -6n = -12 Divide each side by '-6'. n = 2 Simplifying n = 2
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