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Simplifying 4n = 21 + -1n Solving 4n = 21 + -1n Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add 'n' to each side of the equation. 4n + n = 21 + -1n + n Combine like terms: 4n + n = 5n 5n = 21 + -1n + n Combine like terms: -1n + n = 0 5n = 21 + 0 5n = 21 Divide each side by '5'. n = 4.2 Simplifying n = 4.2
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