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Simplifying -81 = -4n + -1 Reorder the terms: -81 = -1 + -4n Solving -81 = -1 + -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. -81 + 4n = -1 + -4n + 4n Combine like terms: -4n + 4n = 0 -81 + 4n = -1 + 0 -81 + 4n = -1 Add '81' to each side of the equation. -81 + 81 + 4n = -1 + 81 Combine like terms: -81 + 81 = 0 0 + 4n = -1 + 81 4n = -1 + 81 Combine like terms: -1 + 81 = 80 4n = 80 Divide each side by '4'. n = 20 Simplifying n = 20
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