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Simplifying -1n + 3(7 + -8n) = -129 -1n + (7 * 3 + -8n * 3) = -129 -1n + (21 + -24n) = -129 Reorder the terms: 21 + -1n + -24n = -129 Combine like terms: -1n + -24n = -25n 21 + -25n = -129 Solving 21 + -25n = -129 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 + -25n = -129 + -21 Combine like terms: 21 + -21 = 0 0 + -25n = -129 + -21 -25n = -129 + -21 Combine like terms: -129 + -21 = -150 -25n = -150 Divide each side by '-25'. n = 6 Simplifying n = 6
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