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Simplifying 7n + 3 + -5n = 21 Reorder the terms: 3 + 7n + -5n = 21 Combine like terms: 7n + -5n = 2n 3 + 2n = 21 Solving 3 + 2n = 21 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + 2n = 21 + -3 Combine like terms: 3 + -3 = 0 0 + 2n = 21 + -3 2n = 21 + -3 Combine like terms: 21 + -3 = 18 2n = 18 Divide each side by '2'. n = 9 Simplifying n = 9
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