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Simplifying n + (n + -2) = 90 Reorder the terms: n + (-2 + n) = 90 Remove parenthesis around (-2 + n) n + -2 + n = 90 Reorder the terms: -2 + n + n = 90 Combine like terms: n + n = 2n -2 + 2n = 90 Solving -2 + 2n = 90 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 + 2n = 90 + 2 Combine like terms: -2 + 2 = 0 0 + 2n = 90 + 2 2n = 90 + 2 Combine like terms: 90 + 2 = 92 2n = 92 Divide each side by '2'. n = 46 Simplifying n = 46
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