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Simplifying -9 = 9(9 + -5n) -9 = (9 * 9 + -5n * 9) -9 = (81 + -45n) Solving -9 = 81 + -45n Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '45n' to each side of the equation. -9 + 45n = 81 + -45n + 45n Combine like terms: -45n + 45n = 0 -9 + 45n = 81 + 0 -9 + 45n = 81 Add '9' to each side of the equation. -9 + 9 + 45n = 81 + 9 Combine like terms: -9 + 9 = 0 0 + 45n = 81 + 9 45n = 81 + 9 Combine like terms: 81 + 9 = 90 45n = 90 Divide each side by '45'. n = 2 Simplifying n = 2
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