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Simplifying -9(u + 1) = -3u + 9 Reorder the terms: -9(1 + u) = -3u + 9 (1 * -9 + u * -9) = -3u + 9 (-9 + -9u) = -3u + 9 Reorder the terms: -9 + -9u = 9 + -3u Solving -9 + -9u = 9 + -3u Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '3u' to each side of the equation. -9 + -9u + 3u = 9 + -3u + 3u Combine like terms: -9u + 3u = -6u -9 + -6u = 9 + -3u + 3u Combine like terms: -3u + 3u = 0 -9 + -6u = 9 + 0 -9 + -6u = 9 Add '9' to each side of the equation. -9 + 9 + -6u = 9 + 9 Combine like terms: -9 + 9 = 0 0 + -6u = 9 + 9 -6u = 9 + 9 Combine like terms: 9 + 9 = 18 -6u = 18 Divide each side by '-6'. u = -3 Simplifying u = -3
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