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Simplifying 7n + -12 + 2n + 3 = 18 Reorder the terms: -12 + 3 + 7n + 2n = 18 Combine like terms: -12 + 3 = -9 -9 + 7n + 2n = 18 Combine like terms: 7n + 2n = 9n -9 + 9n = 18 Solving -9 + 9n = 18 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 + 9n = 18 + 9 Combine like terms: -9 + 9 = 0 0 + 9n = 18 + 9 9n = 18 + 9 Combine like terms: 18 + 9 = 27 9n = 27 Divide each side by '9'. n = 3 Simplifying n = 3
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