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Simplifying (2n + 21) + (4n + 15) = 0 Reorder the terms: (21 + 2n) + (4n + 15) = 0 Remove parenthesis around (21 + 2n) 21 + 2n + (4n + 15) = 0 Reorder the terms: 21 + 2n + (15 + 4n) = 0 Remove parenthesis around (15 + 4n) 21 + 2n + 15 + 4n = 0 Reorder the terms: 21 + 15 + 2n + 4n = 0 Combine like terms: 21 + 15 = 36 36 + 2n + 4n = 0 Combine like terms: 2n + 4n = 6n 36 + 6n = 0 Solving 36 + 6n = 0 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-36' to each side of the equation. 36 + -36 + 6n = 0 + -36 Combine like terms: 36 + -36 = 0 0 + 6n = 0 + -36 6n = 0 + -36 Combine like terms: 0 + -36 = -36 6n = -36 Divide each side by '6'. n = -6 Simplifying n = -6
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