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Simplifying n + 2n + (n + -2) = 84 Reorder the terms: n + 2n + (-2 + n) = 84 Remove parenthesis around (-2 + n) n + 2n + -2 + n = 84 Reorder the terms: -2 + n + 2n + n = 84 Combine like terms: n + 2n = 3n -2 + 3n + n = 84 Combine like terms: 3n + n = 4n -2 + 4n = 84 Solving -2 + 4n = 84 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + 4n = 84 + 2 Combine like terms: -2 + 2 = 0 0 + 4n = 84 + 2 4n = 84 + 2 Combine like terms: 84 + 2 = 86 4n = 86 Divide each side by '4'. n = 21.5 Simplifying n = 21.5
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