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Simplifying n + 9 = 4n Reorder the terms: 9 + n = 4n Solving 9 + n = 4n Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-4n' to each side of the equation. 9 + n + -4n = 4n + -4n Combine like terms: n + -4n = -3n 9 + -3n = 4n + -4n Combine like terms: 4n + -4n = 0 9 + -3n = 0 Add '-9' to each side of the equation. 9 + -9 + -3n = 0 + -9 Combine like terms: 9 + -9 = 0 0 + -3n = 0 + -9 -3n = 0 + -9 Combine like terms: 0 + -9 = -9 -3n = -9 Divide each side by '-3'. n = 3 Simplifying n = 3
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