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Simplifying 21 = 2(3n + 7) + 15 Reorder the terms: 21 = 2(7 + 3n) + 15 21 = (7 * 2 + 3n * 2) + 15 21 = (14 + 6n) + 15 Reorder the terms: 21 = 14 + 15 + 6n Combine like terms: 14 + 15 = 29 21 = 29 + 6n Solving 21 = 29 + 6n Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-6n' to each side of the equation. 21 + -6n = 29 + 6n + -6n Combine like terms: 6n + -6n = 0 21 + -6n = 29 + 0 21 + -6n = 29 Add '-21' to each side of the equation. 21 + -21 + -6n = 29 + -21 Combine like terms: 21 + -21 = 0 0 + -6n = 29 + -21 -6n = 29 + -21 Combine like terms: 29 + -21 = 8 -6n = 8 Divide each side by '-6'. n = -1.333333333 Simplifying n = -1.333333333
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