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Simplifying 55n + 5(9 + -1n) = 315 55n + (9 * 5 + -1n * 5) = 315 55n + (45 + -5n) = 315 Reorder the terms: 45 + 55n + -5n = 315 Combine like terms: 55n + -5n = 50n 45 + 50n = 315 Solving 45 + 50n = 315 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 + 50n = 315 + -45 Combine like terms: 45 + -45 = 0 0 + 50n = 315 + -45 50n = 315 + -45 Combine like terms: 315 + -45 = 270 50n = 270 Divide each side by '50'. n = 5.4 Simplifying n = 5.4
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