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Simplifying 3(1 + 7n) = 23 + n (1 * 3 + 7n * 3) = 23 + n (3 + 21n) = 23 + n Solving 3 + 21n = 23 + 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 + 21n + -1n = 23 + n + -1n Combine like terms: 21n + -1n = 20n 3 + 20n = 23 + n + -1n Combine like terms: n + -1n = 0 3 + 20n = 23 + 0 3 + 20n = 23 Add '-3' to each side of the equation. 3 + -3 + 20n = 23 + -3 Combine like terms: 3 + -3 = 0 0 + 20n = 23 + -3 20n = 23 + -3 Combine like terms: 23 + -3 = 20 20n = 20 Divide each side by '20'. n = 1 Simplifying n = 1
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