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Simplifying 9(n + 2(n + -2)) = 45 Reorder the terms: 9(n + 2(-2 + n)) = 45 9(n + (-2 * 2 + n * 2)) = 45 9(n + (-4 + 2n)) = 45 Reorder the terms: 9(-4 + n + 2n) = 45 Combine like terms: n + 2n = 3n 9(-4 + 3n) = 45 (-4 * 9 + 3n * 9) = 45 (-36 + 27n) = 45 Solving -36 + 27n = 45 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '36' to each side of the equation. -36 + 36 + 27n = 45 + 36 Combine like terms: -36 + 36 = 0 0 + 27n = 45 + 36 27n = 45 + 36 Combine like terms: 45 + 36 = 81 27n = 81 Divide each side by '27'. n = 3 Simplifying n = 3
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