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Simplifying -6u + 3(u + 7) = 9 Reorder the terms: -6u + 3(7 + u) = 9 -6u + (7 * 3 + u * 3) = 9 -6u + (21 + 3u) = 9 Reorder the terms: 21 + -6u + 3u = 9 Combine like terms: -6u + 3u = -3u 21 + -3u = 9 Solving 21 + -3u = 9 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -21 + -3u = 9 + -21 Combine like terms: 21 + -21 = 0 0 + -3u = 9 + -21 -3u = 9 + -21 Combine like terms: 9 + -21 = -12 -3u = -12 Divide each side by '-3'. u = 4 Simplifying u = 4
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