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