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Simplifying 21 = -6u + 3(u + 3) Reorder the terms: 21 = -6u + 3(3 + u) 21 = -6u + (3 * 3 + u * 3) 21 = -6u + (9 + 3u) Reorder the terms: 21 = 9 + -6u + 3u Combine like terms: -6u + 3u = -3u 21 = 9 + -3u Solving 21 = 9 + -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 = 9 + -3u + 3u Combine like terms: -3u + 3u = 0 21 + 3u = 9 + 0 21 + 3u = 9 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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