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Simplifying 4n + -21 = n + 15 Reorder the terms: -21 + 4n = n + 15 Reorder the terms: -21 + 4n = 15 + n Solving -21 + 4n = 15 + 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 = 15 + n + -1n Combine like terms: 4n + -1n = 3n -21 + 3n = 15 + n + -1n Combine like terms: n + -1n = 0 -21 + 3n = 15 + 0 -21 + 3n = 15 Add '21' to each side of the equation. -21 + 21 + 3n = 15 + 21 Combine like terms: -21 + 21 = 0 0 + 3n = 15 + 21 3n = 15 + 21 Combine like terms: 15 + 21 = 36 3n = 36 Divide each side by '3'. n = 12 Simplifying n = 12
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