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Simplifying 7(3 + n) = 140 + 21 (3 * 7 + n * 7) = 140 + 21 (21 + 7n) = 140 + 21 Combine like terms: 140 + 21 = 161 21 + 7n = 161 Solving 21 + 7n = 161 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -21 + 7n = 161 + -21 Combine like terms: 21 + -21 = 0 0 + 7n = 161 + -21 7n = 161 + -21 Combine like terms: 161 + -21 = 140 7n = 140 Divide each side by '7'. n = 20 Simplifying n = 20
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