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Simplifying 21 = -6u + 3(u + 4) Reorder the terms: 21 = -6u + 3(4 + u) 21 = -6u + (4 * 3 + u * 3) 21 = -6u + (12 + 3u) Reorder the terms: 21 = 12 + -6u + 3u Combine like terms: -6u + 3u = -3u 21 = 12 + -3u Solving 21 = 12 + -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 = 12 + -3u + 3u Combine like terms: -3u + 3u = 0 21 + 3u = 12 + 0 21 + 3u = 12 Add '-21' to each side of the equation. 21 + -21 + 3u = 12 + -21 Combine like terms: 21 + -21 = 0 0 + 3u = 12 + -21 3u = 12 + -21 Combine like terms: 12 + -21 = -9 3u = -9 Divide each side by '3'. u = -3 Simplifying u = -3
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