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Simplifying (n + -9) + n = 0 Reorder the terms: (-9 + n) + n = 0 Remove parenthesis around (-9 + n) -9 + n + n = 0 Combine like terms: n + n = 2n -9 + 2n = 0 Solving -9 + 2n = 0 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 = 0 + 9 Combine like terms: -9 + 9 = 0 0 + 2n = 0 + 9 2n = 0 + 9 Combine like terms: 0 + 9 = 9 2n = 9 Divide each side by '2'. n = 4.5 Simplifying n = 4.5
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