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Simplifying 4n + 15 + 3n = 90 Reorder the terms: 15 + 4n + 3n = 90 Combine like terms: 4n + 3n = 7n 15 + 7n = 90 Solving 15 + 7n = 90 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 + 7n = 90 + -15 Combine like terms: 15 + -15 = 0 0 + 7n = 90 + -15 7n = 90 + -15 Combine like terms: 90 + -15 = 75 7n = 75 Divide each side by '7'. n = 10.71428571 Simplifying n = 10.71428571
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