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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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