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Simplifying 3 + 7n = 21 + n Solving 3 + 7n = 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. 3 + 7n + -1n = 21 + n + -1n Combine like terms: 7n + -1n = 6n 3 + 6n = 21 + n + -1n Combine like terms: n + -1n = 0 3 + 6n = 21 + 0 3 + 6n = 21 Add '-3' to each side of the equation. 3 + -3 + 6n = 21 + -3 Combine like terms: 3 + -3 = 0 0 + 6n = 21 + -3 6n = 21 + -3 Combine like terms: 21 + -3 = 18 6n = 18 Divide each side by '6'. n = 3 Simplifying n = 3
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