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Simplifying 4n + -21 + 5n = 51 Reorder the terms: -21 + 4n + 5n = 51 Combine like terms: 4n + 5n = 9n -21 + 9n = 51 Solving -21 + 9n = 51 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '21' to each side of the equation. -21 + 21 + 9n = 51 + 21 Combine like terms: -21 + 21 = 0 0 + 9n = 51 + 21 9n = 51 + 21 Combine like terms: 51 + 21 = 72 9n = 72 Divide each side by '9'. n = 8 Simplifying n = 8
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