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Simplifying 3n + 7(-3 + 4n) = 0 3n + (-3 * 7 + 4n * 7) = 0 3n + (-21 + 28n) = 0 Reorder the terms: -21 + 3n + 28n = 0 Combine like terms: 3n + 28n = 31n -21 + 31n = 0 Solving -21 + 31n = 0 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 + 31n = 0 + 21 Combine like terms: -21 + 21 = 0 0 + 31n = 0 + 21 31n = 0 + 21 Combine like terms: 0 + 21 = 21 31n = 21 Divide each side by '31'. n = 0.6774193548 Simplifying n = 0.6774193548
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