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Simplifying 2n + 6 = 21 + -1n Reorder the terms: 6 + 2n = 21 + -1n Solving 6 + 2n = 21 + -1n Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add 'n' to each side of the equation. 6 + 2n + n = 21 + -1n + n Combine like terms: 2n + n = 3n 6 + 3n = 21 + -1n + n Combine like terms: -1n + n = 0 6 + 3n = 21 + 0 6 + 3n = 21 Add '-6' to each side of the equation. 6 + -6 + 3n = 21 + -6 Combine like terms: 6 + -6 = 0 0 + 3n = 21 + -6 3n = 21 + -6 Combine like terms: 21 + -6 = 15 3n = 15 Divide each side by '3'. n = 5 Simplifying n = 5
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