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Simplifying 81 = 3n + 42 Reorder the terms: 81 = 42 + 3n Solving 81 = 42 + 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. 81 + -3n = 42 + 3n + -3n Combine like terms: 3n + -3n = 0 81 + -3n = 42 + 0 81 + -3n = 42 Add '-81' to each side of the equation. 81 + -81 + -3n = 42 + -81 Combine like terms: 81 + -81 = 0 0 + -3n = 42 + -81 -3n = 42 + -81 Combine like terms: 42 + -81 = -39 -3n = -39 Divide each side by '-3'. n = 13 Simplifying n = 13
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