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Simplifying -5(5n + 3) + 7n = 129 Reorder the terms: -5(3 + 5n) + 7n = 129 (3 * -5 + 5n * -5) + 7n = 129 (-15 + -25n) + 7n = 129 Combine like terms: -25n + 7n = -18n -15 + -18n = 129 Solving -15 + -18n = 129 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '15' to each side of the equation. -15 + 15 + -18n = 129 + 15 Combine like terms: -15 + 15 = 0 0 + -18n = 129 + 15 -18n = 129 + 15 Combine like terms: 129 + 15 = 144 -18n = 144 Divide each side by '-18'. n = -8 Simplifying n = -8
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