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Simplifying 9n + -21 = 4n + 4 Reorder the terms: -21 + 9n = 4n + 4 Reorder the terms: -21 + 9n = 4 + 4n Solving -21 + 9n = 4 + 4n Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-4n' to each side of the equation. -21 + 9n + -4n = 4 + 4n + -4n Combine like terms: 9n + -4n = 5n -21 + 5n = 4 + 4n + -4n Combine like terms: 4n + -4n = 0 -21 + 5n = 4 + 0 -21 + 5n = 4 Add '21' to each side of the equation. -21 + 21 + 5n = 4 + 21 Combine like terms: -21 + 21 = 0 0 + 5n = 4 + 21 5n = 4 + 21 Combine like terms: 4 + 21 = 25 5n = 25 Divide each side by '5'. n = 5 Simplifying n = 5
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