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Simplifying 5n + -3n + -4 = 21 Reorder the terms: -4 + 5n + -3n = 21 Combine like terms: 5n + -3n = 2n -4 + 2n = 21 Solving -4 + 2n = 21 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + 2n = 21 + 4 Combine like terms: -4 + 4 = 0 0 + 2n = 21 + 4 2n = 21 + 4 Combine like terms: 21 + 4 = 25 2n = 25 Divide each side by '2'. n = 12.5 Simplifying n = 12.5
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