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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 = 105 7n = 105 Divide each side by '7'. n = 15 Simplifying n = 15
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