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