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Simplifying -9 = -3(2 + u) -9 = (2 * -3 + u * -3) -9 = (-6 + -3u) Solving -9 = -6 + -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 + 3u = -6 + -3u + 3u Combine like terms: -3u + 3u = 0 -9 + 3u = -6 + 0 -9 + 3u = -6 Add '9' to each side of the equation. -9 + 9 + 3u = -6 + 9 Combine like terms: -9 + 9 = 0 0 + 3u = -6 + 9 3u = -6 + 9 Combine like terms: -6 + 9 = 3 3u = 3 Divide each side by '3'. u = 1 Simplifying u = 1
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