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Simplifying -21 = -7n + 3 + n Reorder the terms: -21 = 3 + -7n + n Combine like terms: -7n + n = -6n -21 = 3 + -6n Solving -21 = 3 + -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 = 3 + -6n + 6n Combine like terms: -6n + 6n = 0 -21 + 6n = 3 + 0 -21 + 6n = 3 Add '21' to each side of the equation. -21 + 21 + 6n = 3 + 21 Combine like terms: -21 + 21 = 0 0 + 6n = 3 + 21 6n = 3 + 21 Combine like terms: 3 + 21 = 24 6n = 24 Divide each side by '6'. n = 4 Simplifying n = 4
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