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Simplifying 3(4n + -5) + 9n = 0 Reorder the terms: 3(-5 + 4n) + 9n = 0 (-5 * 3 + 4n * 3) + 9n = 0 (-15 + 12n) + 9n = 0 Combine like terms: 12n + 9n = 21n -15 + 21n = 0 Solving -15 + 21n = 0 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 + 21n = 0 + 15 Combine like terms: -15 + 15 = 0 0 + 21n = 0 + 15 21n = 0 + 15 Combine like terms: 0 + 15 = 15 21n = 15 Divide each side by '21'. n = 0.7142857143 Simplifying n = 0.7142857143
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