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Simplifying 21 = 2(3n + 7) + 15n Reorder the terms: 21 = 2(7 + 3n) + 15n 21 = (7 * 2 + 3n * 2) + 15n 21 = (14 + 6n) + 15n Combine like terms: 6n + 15n = 21n 21 = 14 + 21n Solving 21 = 14 + 21n Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-21n' to each side of the equation. 21 + -21n = 14 + 21n + -21n Combine like terms: 21n + -21n = 0 21 + -21n = 14 + 0 21 + -21n = 14 Add '-21' to each side of the equation. 21 + -21 + -21n = 14 + -21 Combine like terms: 21 + -21 = 0 0 + -21n = 14 + -21 -21n = 14 + -21 Combine like terms: 14 + -21 = -7 -21n = -7 Divide each side by '-21'. n = 0.3333333333 Simplifying n = 0.3333333333
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