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Simplifying 4(n) = 21 + n Solving 4n = 21 + 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. 4n + -1n = 21 + n + -1n Combine like terms: 4n + -1n = 3n 3n = 21 + n + -1n Combine like terms: n + -1n = 0 3n = 21 + 0 3n = 21 Divide each side by '3'. n = 7 Simplifying n = 7
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