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Simplifying 21 = -6u + 3(u + 6) Reorder the terms: 21 = -6u + 3(6 + u) 21 = -6u + (6 * 3 + u * 3) 21 = -6u + (18 + 3u) Reorder the terms: 21 = 18 + -6u + 3u Combine like terms: -6u + 3u = -3u 21 = 18 + -3u Solving 21 = 18 + -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. 21 + 3u = 18 + -3u + 3u Combine like terms: -3u + 3u = 0 21 + 3u = 18 + 0 21 + 3u = 18 Add '-21' to each side of the equation. 21 + -21 + 3u = 18 + -21 Combine like terms: 21 + -21 = 0 0 + 3u = 18 + -21 3u = 18 + -21 Combine like terms: 18 + -21 = -3 3u = -3 Divide each side by '3'. u = -1 Simplifying u = -1
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