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Simplifying 9n + 12n + -45 = 0 Reorder the terms: -45 + 9n + 12n = 0 Combine like terms: 9n + 12n = 21n -45 + 21n = 0 Solving -45 + 21n = 0 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '45' to each side of the equation. -45 + 45 + 21n = 0 + 45 Combine like terms: -45 + 45 = 0 0 + 21n = 0 + 45 21n = 0 + 45 Combine like terms: 0 + 45 = 45 21n = 45 Divide each side by '21'. n = 2.142857143 Simplifying n = 2.142857143
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