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Simplifying -21 = n + 3 + -5n Reorder the terms: -21 = 3 + n + -5n Combine like terms: n + -5n = -4n -21 = 3 + -4n Solving -21 = 3 + -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 + 4n = 3 + -4n + 4n Combine like terms: -4n + 4n = 0 -21 + 4n = 3 + 0 -21 + 4n = 3 Add '21' to each side of the equation. -21 + 21 + 4n = 3 + 21 Combine like terms: -21 + 21 = 0 0 + 4n = 3 + 21 4n = 3 + 21 Combine like terms: 3 + 21 = 24 4n = 24 Divide each side by '4'. n = 6 Simplifying n = 6
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