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Simplifying 7(9n + 9) = 315 Reorder the terms: 7(9 + 9n) = 315 (9 * 7 + 9n * 7) = 315 (63 + 63n) = 315 Solving 63 + 63n = 315 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-63' to each side of the equation. 63 + -63 + 63n = 315 + -63 Combine like terms: 63 + -63 = 0 0 + 63n = 315 + -63 63n = 315 + -63 Combine like terms: 315 + -63 = 252 63n = 252 Divide each side by '63'. n = 4 Simplifying n = 4
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