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Simplifying 81 = n + 4 + 9 Reorder the terms: 81 = 4 + 9 + n Combine like terms: 4 + 9 = 13 81 = 13 + n Solving 81 = 13 + n Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-1n' to each side of the equation. 81 + -1n = 13 + n + -1n Combine like terms: n + -1n = 0 81 + -1n = 13 + 0 81 + -1n = 13 Add '-81' to each side of the equation. 81 + -81 + -1n = 13 + -81 Combine like terms: 81 + -81 = 0 0 + -1n = 13 + -81 -1n = 13 + -81 Combine like terms: 13 + -81 = -68 -1n = -68 Divide each side by '-1'. n = 68 Simplifying n = 68
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