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