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Simplifying 2(n + -9) + n = 21 Reorder the terms: 2(-9 + n) + n = 21 (-9 * 2 + n * 2) + n = 21 (-18 + 2n) + n = 21 Combine like terms: 2n + n = 3n -18 + 3n = 21 Solving -18 + 3n = 21 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '18' to each side of the equation. -18 + 18 + 3n = 21 + 18 Combine like terms: -18 + 18 = 0 0 + 3n = 21 + 18 3n = 21 + 18 Combine like terms: 21 + 18 = 39 3n = 39 Divide each side by '3'. n = 13 Simplifying n = 13
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