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Simplifying (n + -9) * 9 = 90 Reorder the terms: (-9 + n) * 9 = 90 Reorder the terms for easier multiplication: 9(-9 + n) = 90 (-9 * 9 + n * 9) = 90 (-81 + 9n) = 90 Solving -81 + 9n = 90 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '81' to each side of the equation. -81 + 81 + 9n = 90 + 81 Combine like terms: -81 + 81 = 0 0 + 9n = 90 + 81 9n = 90 + 81 Combine like terms: 90 + 81 = 171 9n = 171 Divide each side by '9'. n = 19 Simplifying n = 19
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