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Simplifying 81 = 13n + 3 Reorder the terms: 81 = 3 + 13n Solving 81 = 3 + 13n Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-13n' to each side of the equation. 81 + -13n = 3 + 13n + -13n Combine like terms: 13n + -13n = 0 81 + -13n = 3 + 0 81 + -13n = 3 Add '-81' to each side of the equation. 81 + -81 + -13n = 3 + -81 Combine like terms: 81 + -81 = 0 0 + -13n = 3 + -81 -13n = 3 + -81 Combine like terms: 3 + -81 = -78 -13n = -78 Divide each side by '-13'. n = 6 Simplifying n = 6
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