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Simplifying n + (n + -9) = 45 Reorder the terms: n + (-9 + n) = 45 Remove parenthesis around (-9 + n) n + -9 + n = 45 Reorder the terms: -9 + n + n = 45 Combine like terms: n + n = 2n -9 + 2n = 45 Solving -9 + 2n = 45 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + 2n = 45 + 9 Combine like terms: -9 + 9 = 0 0 + 2n = 45 + 9 2n = 45 + 9 Combine like terms: 45 + 9 = 54 2n = 54 Divide each side by '2'. n = 27 Simplifying n = 27
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