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Simplifying 21 = -7u + 4(u + 6) Reorder the terms: 21 = -7u + 4(6 + u) 21 = -7u + (6 * 4 + u * 4) 21 = -7u + (24 + 4u) Reorder the terms: 21 = 24 + -7u + 4u Combine like terms: -7u + 4u = -3u 21 = 24 + -3u Solving 21 = 24 + -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 = 24 + -3u + 3u Combine like terms: -3u + 3u = 0 21 + 3u = 24 + 0 21 + 3u = 24 Add '-21' to each side of the equation. 21 + -21 + 3u = 24 + -21 Combine like terms: 21 + -21 = 0 0 + 3u = 24 + -21 3u = 24 + -21 Combine like terms: 24 + -21 = 3 3u = 3 Divide each side by '3'. u = 1 Simplifying u = 1
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