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