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Simplifying 100n + -10(n + -8) = 620 Reorder the terms: 100n + -10(-8 + n) = 620 100n + (-8 * -10 + n * -10) = 620 100n + (80 + -10n) = 620 Reorder the terms: 80 + 100n + -10n = 620 Combine like terms: 100n + -10n = 90n 80 + 90n = 620 Solving 80 + 90n = 620 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-80' to each side of the equation. 80 + -80 + 90n = 620 + -80 Combine like terms: 80 + -80 = 0 0 + 90n = 620 + -80 90n = 620 + -80 Combine like terms: 620 + -80 = 540 90n = 540 Divide each side by '90'. n = 6 Simplifying n = 6
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