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Simplifying 9 = (-3) + n + 2n 9 = -3 + n + 2n Combine like terms: n + 2n = 3n 9 = -3 + 3n Solving 9 = -3 + 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. 9 + -3n = -3 + 3n + -3n Combine like terms: 3n + -3n = 0 9 + -3n = -3 + 0 9 + -3n = -3 Add '-9' to each side of the equation. 9 + -9 + -3n = -3 + -9 Combine like terms: 9 + -9 = 0 0 + -3n = -3 + -9 -3n = -3 + -9 Combine like terms: -3 + -9 = -12 -3n = -12 Divide each side by '-3'. n = 4 Simplifying n = 4
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