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Simplifying 9 + 2n = 21 Solving 9 + 2n = 21 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 + 2n = 21 + -9 Combine like terms: 9 + -9 = 0 0 + 2n = 21 + -9 2n = 21 + -9 Combine like terms: 21 + -9 = 12 2n = 12 Divide each side by '2'. n = 6 Simplifying n = 6
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