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Simplifying -1n + 3(7n + 7) = 141 Reorder the terms: -1n + 3(7 + 7n) = 141 -1n + (7 * 3 + 7n * 3) = 141 -1n + (21 + 21n) = 141 Reorder the terms: 21 + -1n + 21n = 141 Combine like terms: -1n + 21n = 20n 21 + 20n = 141 Solving 21 + 20n = 141 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 + 20n = 141 + -21 Combine like terms: 21 + -21 = 0 0 + 20n = 141 + -21 20n = 141 + -21 Combine like terms: 141 + -21 = 120 20n = 120 Divide each side by '20'. n = 6 Simplifying n = 6
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