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Simplifying n + 2n + -18 = n Reorder the terms: -18 + n + 2n = n Combine like terms: n + 2n = 3n -18 + 3n = n Solving -18 + 3n = n Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-1n' to each side of the equation. -18 + 3n + -1n = n + -1n Combine like terms: 3n + -1n = 2n -18 + 2n = n + -1n Combine like terms: n + -1n = 0 -18 + 2n = 0 Add '18' to each side of the equation. -18 + 18 + 2n = 0 + 18 Combine like terms: -18 + 18 = 0 0 + 2n = 0 + 18 2n = 0 + 18 Combine like terms: 0 + 18 = 18 2n = 18 Divide each side by '2'. n = 9 Simplifying n = 9
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