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Simplifying 4n + 21 = n Reorder the terms: 21 + 4n = n Solving 21 + 4n = n Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-1n' to each side of the equation. 21 + 4n + -1n = n + -1n Combine like terms: 4n + -1n = 3n 21 + 3n = n + -1n Combine like terms: n + -1n = 0 21 + 3n = 0 Add '-21' to each side of the equation. 21 + -21 + 3n = 0 + -21 Combine like terms: 21 + -21 = 0 0 + 3n = 0 + -21 3n = 0 + -21 Combine like terms: 0 + -21 = -21 3n = -21 Divide each side by '3'. n = -7 Simplifying n = -7
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