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Simplifying -12 = 9 + -3n Solving -12 = 9 + -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. -12 + 3n = 9 + -3n + 3n Combine like terms: -3n + 3n = 0 -12 + 3n = 9 + 0 -12 + 3n = 9 Add '12' to each side of the equation. -12 + 12 + 3n = 9 + 12 Combine like terms: -12 + 12 = 0 0 + 3n = 9 + 12 3n = 9 + 12 Combine like terms: 9 + 12 = 21 3n = 21 Divide each side by '3'. n = 7 Simplifying n = 7
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