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Simplifying 2n + 15 = 4n + 21 Reorder the terms: 15 + 2n = 4n + 21 Reorder the terms: 15 + 2n = 21 + 4n Solving 15 + 2n = 21 + 4n Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-4n' to each side of the equation. 15 + 2n + -4n = 21 + 4n + -4n Combine like terms: 2n + -4n = -2n 15 + -2n = 21 + 4n + -4n Combine like terms: 4n + -4n = 0 15 + -2n = 21 + 0 15 + -2n = 21 Add '-15' to each side of the equation. 15 + -15 + -2n = 21 + -15 Combine like terms: 15 + -15 = 0 0 + -2n = 21 + -15 -2n = 21 + -15 Combine like terms: 21 + -15 = 6 -2n = 6 Divide each side by '-2'. n = -3 Simplifying n = -3
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