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Simplifying 7n + -2(3 + n) = 9 7n + (3 * -2 + n * -2) = 9 7n + (-6 + -2n) = 9 Reorder the terms: -6 + 7n + -2n = 9 Combine like terms: 7n + -2n = 5n -6 + 5n = 9 Solving -6 + 5n = 9 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '6' to each side of the equation. -6 + 6 + 5n = 9 + 6 Combine like terms: -6 + 6 = 0 0 + 5n = 9 + 6 5n = 9 + 6 Combine like terms: 9 + 6 = 15 5n = 15 Divide each side by '5'. n = 3 Simplifying n = 3
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