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Simplifying 21 = 15 + -6n Solving 21 = 15 + -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 = 15 + -6n + 6n Combine like terms: -6n + 6n = 0 21 + 6n = 15 + 0 21 + 6n = 15 Add '-21' to each side of the equation. 21 + -21 + 6n = 15 + -21 Combine like terms: 21 + -21 = 0 0 + 6n = 15 + -21 6n = 15 + -21 Combine like terms: 15 + -21 = -6 6n = -6 Divide each side by '6'. n = -1 Simplifying n = -1
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